Spoilery speculation, and help with a list...

[dougs]

Lots of people are speculating about the season arc, and collecting evidence.

So what I'd like is a definitive list of references to planets that have been lost, or people who want to hijack and/or remodel another planet for their own use... and, in this season at least, references to breeding or offspring as a motive for the hijack.

Back here there are a couple of references to this season and the 2005 season:

Partners In Crime - 'What do you mean lost? How can you lose a planet?'
Fires of Pompeii - 'What d'you mean, 'gone'? Where's it gone?' 'Pyrovillia is lost'
[...]
Rose - The Nestene Consciousness's planet died
The Long Game - The Jagrafess's planet is kaboom

In this season, we have:

2008x01 "Partners in Crime" -- The Adipose parents using Earth as a breeding ground for their children.
2008x02 "The Fires of Pompeii" -- The Pyrovillians moving in because their own world is lost.
2008x03 "Planet of the Ood" -- Humans taking over the Oodsphere as a slave farm.
2008x04/x05 "The Sontaran Stratagem"/"The Poison Sky" -- The Sontarans using Earth as a new clone world, somewhere to raise new clones.
2008x06 "The Doctor's Daughter" -- Hello blatant offspring reference. And terraforming as a core part of the backstory/plot, another planet remodelled by incomers.
2008x07 "The Unicorn and the Wasp" -- the central "villain" was the son of another main character, and was born here where he didn't belong.
2008x08/x09 "Silence in the Library"/"Forest of the Dead" -- another planet "lost" because Lux Senior moved in and remodelled it for his own purposes because of his daughter.

So. Offspring, either as a motive after a planet's been lost or destroyed, or as a motive to take over and/or remodel another planet. And, in a few cases, offspring and/or clones as the core mechanism to achieve that remodelling.

It occurs to me that Gallifrey is lost, could do with being replaced. And the Doctor's got a Daughter...

Season arc, anyone?