Episode 4.10 online synopsis by Radio Times
Radio Times has put up their synopsis of Episode 4.10, with a bit more detail about the cast and crew credits.
A Herald of the New Age
"The knights discover an eerie shrine deep in the forest, which Merlin tells them is best left undisturbed. But the warlock's warnings go unheeded by Sir Elyan, whose careless actions spark a chain of events more terrifying than anyone could possibly have imagined. Sword-and-sorcery drama, starring Colin Morgan, Bradley James and Adetomiwa Edun."
MerlinColin MorganSir ElyanAdetomiwa EdunGaiusRichard WilsonArthurBradley JamesAgravaineNathaniel ParkerDruid boyNicholas CroucherSir LeonRupert YoungSir PercivalTom HopperSir GwaineEoin MackenVoice of the DragonJohn HurtDirectorJeremy WebbProducerJohnny CappsProducerJulian MurphyWriterHoward Overman
A Herald of the New Age
"The knights discover an eerie shrine deep in the forest, which Merlin tells them is best left undisturbed. But the warlock's warnings go unheeded by Sir Elyan, whose careless actions spark a chain of events more terrifying than anyone could possibly have imagined. Sword-and-sorcery drama, starring Colin Morgan, Bradley James and Adetomiwa Edun."
MerlinColin MorganSir ElyanAdetomiwa EdunGaiusRichard WilsonArthurBradley JamesAgravaineNathaniel ParkerDruid boyNicholas CroucherSir LeonRupert YoungSir PercivalTom HopperSir GwaineEoin MackenVoice of the DragonJohn HurtDirectorJeremy WebbProducerJohnny CappsProducerJulian MurphyWriterHoward Overman