Okay, this is a huge list, but I've done the usual thing and broken it down into live action and animation (which I've broken into Marvel and DC). So this year there's been Iron Man 2, Kick-Ass, Jonah Hex, Planet Hulk, Justice League: Crisis on Two Earths, Batman: Under the Red Hood, Superman/Batman: Apocalypse, Superman/Shazam!: Black Adam, Spectre, Jonah Hex (animated), Green Arrow, and new episodes of Smallville, Batman: The Brave and the Bold, Young Justice, The Super Hero Squad Show, and Avengers: Earth's Mightiest Heroes.
Cast list below the cut.
LIVE ACTION
Gil Bellows as Maxwell Lord (Smallville)
Josh Brolin as Jonah Hex (Jonah Hex)
Steve Byers as Desaad (Smallville)
Nicolas Cage as Damon Macready/Big Daddy (Kick-Ass)
Don Cheadle as James Rhodes/War Machine (Iron Man 2)
Michael Daingerfield as Gordon Godfrey (Smallville)
Megan Fox as Tallulah Black/Lilah (Jonah Hex)
Lindsay Hartley as Mad Harriet (Smallville)
Terri Hatcher as Ella Lane (Smallville)
Michael Hogan as Slade Wilson (Smallville)
Britt Irvin as Courtney Whitmore/Stargirl (Smallville)
Scarlett Johansson as Natasha Romanoff (Iron Man 2)
Aaron Johnson as Dave Lizewski/Kick-Ass (Kick-Ass)
Wesley MacInnes as Icicle (Smallville)
John Malkovich as Quentin Turnbull (Jonah Hex)
Christopher Mintz-Plasse as Chris D'Amico/Red Mist (Kick-Ass)
Chloe Moretz as Mindy Macready/Hit-Girl (Kick-Ass)
Keri Lynn Pratt as Cat Grant (Smallville)
Odessa Rae as Silver Banshee (Smallville)
Sam Rockwell as Justin Hammer (Iron Man 2)
Mickey Rourke as Ivan Vanko (Iron Man 2)
Elena Satine as Mera (Smallville)
Michael Shanks as Carter Hall/Hawkman (Smallville)
Jim Shield as Sylvester Pemberton/Star Spangled Kid (Smallville)
Brent Strait as Kent Nelson/Dr. Fate (Smallville)
Mark Strong as Frank D'Amico (Kick-Ass)
Bradley Stryker as Deadshot (Smallville)
Ted Whitall as Rick Flag (Smallville)
Christine Willes as Granny Goodness (Smallville)
ANIMATED (Marvel)
Donald Adams as Governor Churik (Planet Hulk)
Jonathan Adams as Kang the Conquerer (Avengers: Earth's Mightiest Heroes)
Jonathan Adams as T'Chaka (Black Panther)
Charlie Adler as Phil Sheldon (The Super Hero Squad Show)
Dee Bradley Baker as Annihilus (The Super Hero Squad Show)
Troy Baker as Clay Quartermain (Avengers: Earth's Mightiest Heroes)
Troy Baker as Grey Gargoyle (Avengers: Earth's Mightiest Heroes)
Troy Baker as Whirlwind (Avengers: Earth's Mightiest Heroes)
Lisa Ann Beley as Caiera (Planet Hulk)
Ted Biaselli as Terrax (The Super Hero Squad Show)
JB Blanc as Batroc the Leaper (Black Panther)
JB Blanc as Black Knight (Black Panther)
JB Blanc as Heimdall (Avengers: Earth's Mightiest Heroes)
JB Blanc as the Wrecker (Avengers: Earth's Mightiest Heroes)
Brian Bloom as Steve Rogers/Captain America (Avengers: Earth's Mightiest Heroes)
Steve Blum as Fin Fang Foom (The Super Hero Squad Show)
Steve Blum as Heimdall (The Super Hero Squad Show)
Steve Blum as the Red Skull (Avengers: Earth's Mightiest Heroes)
Clancy Brown as Odin (Avengers: Earth's Mightiest Heroes)
Ty Burrell as Captain Marvel (The Super Hero Squad Show)
David Busch as Everett K. Ross (Black Panther)
Cam Clarke as Vector (Avengers: Earth's Mightiest Heroes)
Jeffrey Combs as The Leader (Avengers: Earth's Mightiest Heroes)
Chris Cox as Crimson Dynamo (Avengers: Earth's Mightiest Heroes)
Chris Cox as Clint Barton/Hawkeye (Avengers: Earth's Mightiest Heroes)
Jim Cummings as Android Human Torch (The Super Hero Squad Show)
Jim Cummings as Super-Skrull (The Super Hero Squad Show)
Jim Cummings as Thanos (The Super Hero Squad Show)
EG Daily as Mockingbird (Avengers: Earth's Mightiest Heroes)
Grey DeLisle as Volcana (The Super Hero Squad Show)
Paul Dobson as Beta Ray Bill (Planet Hulk)
Robin Atkin Downes as Abomination (Avengers: Earth's Mightiest Heroes)
Robin Atkin Downes as Baron Zemo (Avengers: Earth's Mightiest Heroes)
Susan Eisenberg as Power Princess (The Super Hero Squad Show)
Andrew Francis as Rick Jones (Iron Man: Armored Adventures)
Keith Ferguson as General Thaddeus "Thunderbolt" Ross (Avengers: Earth's Mightiest Heroes)
Nika Futterman as Sif (Avengers: Earth's Mightiest Heroes)
Mark Gibbon as the Hulk (Iron Man: Armored Adventures)
Jennifer Hale as Carol Danvers (Avengers: Earth's Mightiest Heroes)
Mark Hamill as Chthon (The Super Hero Squad Show)
Mark Hamill as Klaw (Avengers: Earth's Mightiest Heroes)
Mark Hamill as Red Skull (The Super Hero Squad Show)
Jess Harnell as Hercules (The Super Hero Squad Show)
Tricia Helfer as Sif (The Super Hero Squad Show)
Lance Henriksen as Grim Reaper (Avengers: Earth's Mightiest Heroes)
Mark Hildreth as Red King (Planet Hulk)
Cheryl Hines as Stardust (The Super Hero Squad Show)
Djimon Hounsou as T'Challa/The Black Panther (Black Panther)
Hakeem Kae-Kazim as King T'Chaka (Avengers: Earth's Mightiest Heroes)
Rod Keller as Bucky (The Super Hero Squad Show)
Michael Kopsa as Lavin Skee (Planet Hulk)
Maurice LaMarche as Magneto (The Super Hero Squad Show)
Phil LaMarr as JARVIS (Avengers: Earth's Mightiest Heroes)
Phil LaMarr as Simon Williams/Wonder Man (Avengers: Earth's Mightiest Heroes)
Eric Loomis as Tony Stark/Iron Man (Avengers: Earth's Mightiest Heroes)
Peter Lurie as Juggernaut (Black Panther)
Jane Lynch as Nebula (The Super Hero Squad Show)
Jonathan Mankuta as Flatman (The Super Hero Squad Show)
Jonathan Mankuta as Zzzax (The Super Hero Squad Show)
Danny Mann as Mad Thinker (Avengers: Earth's Mightiest Heroes)
Gabriel Mann as Bruce Banner (Avengers: Earth's Mightiest Heroes)
Vanessa Marshall as Natasha Romanoff/Black Widow (Avengers: Earth's Mightiest Heroes)
Vanessa Marshall as Madame Viper (Avengers: Earth's Mightiest Heroes)
James C. Mathis III as the Black Panther (Avengers: Earth's Mightiest Heores)
James C. Mathis III as Bulldozer (Avengers: Earth's Mightiest Heroes)
Scott Menville as Bucky (Avengers: Earth's Mightiest Heroes)
Scott Menville as Quicksilver (The Super Hero Squad Show)
Grant Moninger as Arnim Zola (Avengers: Earth's Mightiest Heroes)
Phil Morris as W'Kabi (Black Panther)
Nolan North as Jimmy Woo (Avengers: Earth's Mightiest Heroes)
Nolan North as Nightcrawler (Black Panther)
Nolan North as Piledriver (Avengers: Earth's Mightiest Heroes)
Liam O'Brien as Hiroim (Planet Hulk)
John O'Hurley as Grandmaster (The Super Hero Squad Show)
Colleen O'Shaughnessey as Janet van Dyne/Wasp (Avengers: Earth's Mightiest Heroes)
Dawn Olivieri as Pepper Potts (Avengers: Earth's Mightiest Heroes)
Adrian Pasdar as Captain America (Black Panther)
Kevin Michael Richardson as Korg (Planet Hulk)
Kevin Michael Richardson as Man-Ape (Avengers: Earth's Mightiest Heroes)
Kevin Michael Richardson as White Panther (Black Panther)
Kevin Michael Richardson as Wolverine (Black Panther)
Russell Roberts as Primus Vand (Planet Hulk)
Bumper Robinson as James "Rhodey" Rhodes (Avengers: Earth's Mightiest Heroes)
Cindy Robinson as Ravonna (Avengers: Earth's Mightiest Heroes)
Jill Scott as Storm (Black Panther)
Roger Craig Smith as Captain Marvel (Avengers: Earth's Mightiest Heroes)
Advah Soudack as Elloe Kaifi (Planet Hulk)
Stephen Stanton as Klaw (Black Panther)
Fred Stoller as Molecule Man (The Super Hero Squad Show)
Tara Strong as Princess Anelle (The Super Hero Squad Show)
Tara Strong as The Scarlet Witch (The Super Hero Squad Show)
Tara Strong as Toro (The Super Hero Squad Show)
George Takei as Galactus (The Super Hero Squad Show)
Fred Tatasciore as Graviton (Avengers: Earth's Mightiest Heroes)
Fred Tatasciore as Yon Rogg (Avengers: Earth's Mightiest Heroes)
Lee Tockar as Android (Planet Hulk)
Sam Vincent as Miek (Planet Hulk)
Kari Wahlgren as Jane Foster (Avengers: Earth's Mightiest Heroes)
Jim Ward as Baron Wolfgang Von Strucker (Avengers: Earth's Mightiest Heroes)
Rick D. Wasserman as the Absorbing Man (Avengers: Earth's Mightiest Heroes)
Rick D. Wasserman as the Hulk (Planet Hulk)
Rick D. Wasserman as Igor Stancheck/Radioactive Man (Black Panther)
Rick D. Wasserman as Thor (Avengers: Earth's Mightiest Heroes)
Adam West as Nighthawk (The Super Hero Squad Show)
Gary Anthony Williams as Thunderball (Avengers: Earth's Mightiest Heroes)
Travis Willingham as Hyperion (The Super Hero Squad Show)
Travis Willingham as Zeus (The Super Hero Squad Show)
Wally Wingert as Henry Pym/Ant-Man/Giant Man (Avengers: Earth's Mightiest Heroes)
Wally Wingert as MODOC (Avengers: Earth's Mightiest Heroes)
Alfre Woodard as Dora Milaje (Black Panther)
Alfre Woodard as Queen Mother (Black Panther)
Kari Wuhrer as Maria Hill (Avengers: Earth's Mightiest Heroes)
ANIMATED (DC)
Jensen Ackles as Red Hood (Batman: Under the Red Hood)
Jonathan Adams as J'onn J'onzz (Justice League: Crisis on Two Earths)
Carlos Alazraqui as Breakdance (Justice League: Crisis on Two Earths)
Rene Auberjonois as Mark Desmond/Blockbuster (Young Justice)
Sebastian Bader as Robin III (Batman: The Brave and the Bold)
Dee Bradley Baker as Animal Vegetable Mineral Man (Batman: The Brave and the Bold)
Dee Bradley Baker as Detective Chimp (Batman: The Brave and the Bold)
Dee Bradley Baker as Dr. Milo (Batman: The Brave and the Bold)
Dee Bradley Baker as J.E.B. Stuart (Batman: The Brave and the Bold)
Dee Bradley Baker as Tin (Batman: The Brave and the Bold)
William Baldwin as Batman (Justice League: Crisis on Two Earths)
Jeff Bennett as Abra Kadabra (Batman: The Brave and the Bold)
Brian Bloom as Oxygen (Batman: The Brave and the Bold)
Brian Bloom as Iron (Batman: The Brave and the Bold)
Brian Bloom as Ultraman (Justice League: Crisis on Two Earths)
Steven Blum as Captain Cold (Batman: The Brave and the Bold)
Steven Blum as Count Vertigo (Green Arrow)
Steven Blum as Heat Wave (Batman: The Brave and the Bold)
Andrea Bowen as Talia (Batman: The Brave and the Bold)
Andre Braugher as Darkseid (Superman/Batman: Apocalypse)
Clancy Brown as Per Degaton (Batman: The Brave and the Bold)
Clancy Brown as Rohtul (Batman: The Brave and the Bold)
Corey Burton as Dr. Mid-Nite (Batman: The Brave and the Bold)
Corey Burton as Doc Magnus (Batman: The Brave and the Bold)
Corey Burton as Killer Moth (Batman: The Brave and the Bold)
Corey Burton as General Zahl (Batman: The Brave and the Bold)
Corey Burton as Mercury (Batman: The Brave and the Bold)
Zach Callison as Billy Batson (Superman/Shazam)
Patrick Cavanaugh as Damian Wayne (Batman: The Brave and the Bold)
Gary Cole as Commissioner Gordon (Batman: Under the Red Hood)
Gary Cole as Jim Corrigan/The Spectre (The Spectre)
Kevin Conroy as Batman of Zurr-En-Arrh (Batman: The Brave and the Bold)
Kevin Conroy as Phantom Stranger (Batman: The Brave and the Bold)
Olivia d'Abo as Elasti-Girl (Batman: The Brave and the Bold)
Bruce Davison as President Slade Wilson (Justice League: Crisis on Two Earths)
Dana Delany as Vilsi Velar (Batman: The Brave and the Bold)
John DiMaggio as Black Adam (Batman: The Brave and the Bold)
John DiMaggio as Black Mask (Batman: The Brave and the Bold)
John DiMaggio as Enemy Ace (Batman: The Brave and the Bold)
John DiMaggio as Faceless Hunter (Batman: The Brave and the Bold)
John DiMaggio as the Joker (Batman: Under the Red Hood)
Rob Atkin Downes as Firefly (Batman: The Brave and the Bold)
Robin Atkin Downes as Kobra (Batman: The Brave and the Bold)
Robin Atkin Downes as Ten-Eyed Man (Batman: The Brave and the Bold)
Robin Atkin Downes as Weather Wizard (Batman: The Brave and the Bold)
George Eads as the Flash (Young Justice)
Greg Ellis as Cavalier (Batman: The Brave and the Bold)
Bill Fagerbakke as Helium (Batman: The Brave and the Bold)
Bill Fagerbakke as Lead (Batman: The Brave and the Bold)
Bill Fagerbakke as Ronnie Raymond (Batman: The Brave and the Bold)
Crispin Freeman as Guardian (Young Justice)
Crispin Freeman as Speedy (Young Justice)
James Garner as Shazam (Superman/Shazam)
James Garrett as Alfred Pennyworth (Batman: The Brave and the Bold)
Summer Glau as Supergirl (Superman/Batman: Apocalypse)
Richard Green as Alternate Jimmy Olsen (Justice League: Crisis on Two Earths)
Bruce Greenwood as Batman (Batman: Under the Red Hood, Young Justice)
Julianne Grossman as Big Barda (Superman/Batman: Apocalypse)
Nicholas Guest as Martian Manhunter (Batman: The Brave and the Bold)
Jennifer Hale as Ice (Batman: The Brave and the Bold)
Mark Hamill as the Spectre (Batman: The Brave and the Bold)
Mark Harmon as Superman (Justice League: Crisis on Two Earths)
Neil Patrick Harris as Nightwing (Batman: Under the Red Hood)
David K. Hill as Negative Man (Batman: The Brave and the Bold)
Jason Isaacs as Ra's al Ghul (Batman: Under the Red Hood)
Thomas Jane as Jonah Hex (Jonah Hex)
Lauri Johnson as Ma Murder (Batman: The Brave and the Bold)
William Katt as Hawkman (Batman: The Brave and the Bold)
Josh Keaton as Aquaman (Justice League: Crisis on Two Earths)
Josh Keaton as The Flash (Justice League: Crisis on Two Earths)
Phil LaMarr as Aquaman (Young Justice)
Phil LaMarr as Dubbilex (Young Justice)
Lex Lang as Batman II/Dick Grayson (Batman: The Brave and the Bold)
Lex Lang as Gold (Batman: The Brave and the Bold)
Lex Lang as Hourman (Batman: The Brave and the Bold)
Lex Lang as Hydrogen (Batman: The Brave and the Bold)
Hope Levy as Stargirl (Batman: The Brave and the Bold)
Yuri Lowenthal as Icicle (Young Justice)
Vanessa Marshall as Batwoman (Batman: The Brave and the Bold)
Vanessa Marshall as Wonder Woman (Justice League: Crisis on Two Earths)
Alex Martella as Young Robin/Jason Todd (Batman: Under the Red Hood)
Vincent Martella as Teen Robin/Jason Todd (Batman: Under the Red Hood)
Jesse McCartney as Robin/Dick Grayson (Young Justice)
Neal McDonough as Green Arrow/Oliver Queen (Green Arrow)
Malcolm McDowell as Merlyn the Magnificent (Green Arrow)
Jim Meskimen as Captain Super (Justice League: Crisis on Two Earths)
Jim Meskimen as Archer (Justice League: Crisis on Two Earths)
Jason Miller as Doll Man (Batman: The Brave and the Bold)
Richard Moll as Moxon (Batman: The Brave and the Bold)
Laraine Newman as Ms. Minerva (Batman: The Brave and the Bold)
Julie Newmar as Martha Wayne (Batman: The Brave and the Bold)
Nolan North as Green Lantern (Justice League: Crisis on Two Earths)
Nolan North as Power Ring (Justice League: Crisis on Two Earths)
Nolan North as Superboy (Young Justice)
Nolan North as Superman (Young Justice)
Nolan North as Zatara (Young Justice)
Chris Noth as Alternate Lex Luthor (Justice League: Crisis on Two Earths)
Peter Onorati as Joe Chill (Batman: The Brave and the Bold)
Hunter Parrish as Geoforce (Batman: The Brave and the Bold)
Hunter Parrish as Kid Flash (Batman: The Brave and the Bold)
Khary Payton as Aqualad/Kaldur'ahm (Young Justice)
Ron Perlman as Double X (Batman: The Brave and the Bold)
Jim Piddock as Alfred Pennyworth (Batman: Under the Red Hood)
Jim Piddock as Shazam (Batman: The Brave and the Bold)
Jim Piddock as Dr. Sivana (Batman: The Brave and the Bold)
Rachel Quaintance as Artemis (Superman/Batman: Apocalypse)
Rachel Quaintance as Lyla/Harbinger (Superman/Batman: Apocalypse)
Peter Renaday as Uncle Sam (Batman: The Brave and the Bold)
Kevin Michael Richardson as Barack Obama (Batman: The Brave and the Bold)
Kevin Michael Richardson as Martian Manhunter (Young Justice)
Kevin Michael Richardson as Mister Tawky Tawny (Superman/Shazam)
Kevin Michael Richardson as Monseiur Mallah (Batman: The Brave and the Bold)
Kevin Michael Richardson as Starro (Batman: The Brave and the Bold)
Henry Rollins as Robotman (Batman: The Brave and the Bold)
Andrea Romano as Stompa (Superman/Batman: Apocalypse)
Andrea Romano as Vicki Vale (Superman/Batman: Apocalypse)
Freddi Rogers as Rose Wilson (Justice League: Crisis on Two Earths)
Stephen Root as The Penguin (Batman: The Brave and the Bold)
Salli Saffioti as Gilotina (Superman/Batman: Apocalypse)
Salli Saffioti as Mad Harriet (Superman/Batman: Apocalypse)
Zack Shada as Aqualad (Batman: The Brave and the Bold)
John Wesley Shipp as Professor Zoom (Batman: The Brave and the Bold)
J.K. Simmons as Guardian (Batman: The Brave and the Bold)
Jason Spisak as Kid Flash/Wally West (Young Justice)
Meghan Strange as Harley Quinn (Batman: The Brave and the Bold)
Tara Strong as Lashina (Superman/Batman: Apocalypse)
Tara Strong as Mary Batson (Batman: The Brave and the Bold)
Preston Strother as Arthur Junior (Batman: The Brave and the Bold)
James Patrick Stuart as The Jester (Justice League: Crisis on Two Earths)
James Patrick Stuart as Johnny Quick (Justice League: Crisis on Two Earths)
Cree Summer as Vixen (Batman: The Brave and the Bold)
Keith Szarabajka as Mr. Freeze (Young Justice)
Fred Tatasciore as AMAZO (Batman: Under the Red Hood)
Fred Tatasciore as Arsenal (Batman: The Brave and the Bold)
Fred Tatasciore as Mutant Master (Batman: The Brave and the Bold)
Fred Tatasciore as Sgt. Rock (Batman: The Brave and the Bold)
Gina Torres as Superwoman (Justice League: Crisis on Two Earths)
Bruce Timm as Captain Super Jr. (Justice League: Crisis on Two Earths)
Bruce Timm as The Riddler (Batman: Under the Red Hood)
Bruce Timm as Uncle Super (Justice League: Crisis on Two Earths)
Alan Tudyk as The Flash II/Barry Allen (Batman: The Brave and the Bold)
Alan Tudyk as Green Arrow (Young Justice)
Hynden Walch as Carbon Dioxide (Batman: The Brave and the Bold)
Hynden Walch as Platinum (Batman: The Brave and the Bold)
Adam West as Thomas Wayne (Batman: The Brave and the Bold)
Mae Whitman as Batgirl (Batman: The Brave and the Bold)
Tyler James Williams as Firestorm/Jason Rusch (Batman: The Brave and the Bold)
Wade Williams as Black Mask (Batman: Under the Red Hood)
James Woods as Owlman (Justice League: Crisis on Two Earths)
Peter Woodward as Ra's al Ghul (Batman: The Brave and the Bold)
Michael-Leon Wooley as Darkseid (Batman: The Brave and the Bold)
Michael-Leon Wooley as Kalibak (Batman: The Brave and the Bold)
Kari Wuhrer as Black Canary (Justice League: Crisis on Two Earths)
Kari Wuhrer as Model Citizen (Justice League: Crisis on Two Earths)
Cedric Yarbrough as Black Lightning (Justice League: Crisis on Two Earths)
Cedric Yarbrough as Firestorm (Justice League: Crisis on Two Earths)
Also polls on Toon Zone for favorite performances:
Marvel -
http://toonzone.net/forums/showthread.php?t=276974 DC -
http://toonzone.net/forums/showthread.php?t=276972