En una estación experimental de la Antártida, un equipo de investigadores descubre a un ente extraño venido del espacio, que según todos los indicios ha permanecido enterrado en la nieve durante más de 100.000 años. Al descongelarse, experimenta una metamorfosis sorprendente.

Un rudo mecánico es elegido para estar despierto y dar mantenimiento al arca interestelar de una nave espacial que mantiene con vida a unos pocos miles de supervivientes de una Tierra moribunda. El peligro llega cuando un alien capaz de cambiar de forma aparece en la nave para acabar con todos los supervivientes.

Tras haberse marchado con los alienígenas, los ancianos de la residencia vuelven a la tierra para que sus amigos extraterrestres recuperen otras cápsulas pérdidas en el océano que corren peligro.

Aliens masquerading as owners of a small town video store distribute tapes that cause anyone who watches them to pleasure themselves and whoever else is nearby.

A faux-documentary directed by Brian Kraft, detailing the disappearance of an anti-war activist during his investigations into Dick Cheney.

When the Doctor, Sarah Jane and Harry arrive in Scotland, having received an urgent request for assistance from the Brigadier, they discover that the mysterious force which has destroyed three oil rigs has left giant teeth marks on the wreckage. The mystery deepens, leading them to the shores of Loch Ness where they find that the legendary monster really does exist – and is the murderous tool of the Zygons, aliens intent on overpowering the planet. The Doctor, his companions and UNIT must find a way to defeat the deadly Loch Ness Monster and its controllers, but the Zygons have the terrifying power to change shape. The Doctor's life has never been in more danger, as the line between allies and enemies is tested to the very limit...