该剧中的博士由13位演员扮演，从一位到另一位演员的改变被写成重生，博士的身体会改变，性格也会改变，每个的描写方式都不同，有时不同的化身会相遇，但他（她）们都扮演同一个角色。

An adult contestant joins a classroom of celebrities to answer elementary-level questions across various topics, vying for a $100,000 prize.

The TARDIS arrives on an apparently deserted and deactivated space station Nerva, otherwise known as the Ark, orbiting Earth in the far future. There the Doctor, Sarah and Harry discover the last survivors of the human race held in suspended animation, Earth having been evacuated thousands of years earlier when solar f…

Lucky Luke becomes the Sheriff of Daisy Town and runs out all the criminals. Then the Dalton brothers arrive and try to get the Indians to break the peace treaty and attack the town.

The Doctor, Sarah and Harry arrive on a desolate and apparently deserted Earth to discover that a group of shipwrecked astronauts from a human colony, GalSec, have been lured there by a fake distress call. One of their number, Roth, tells Sarah of an alien conducting gruesome experiments on him and his crewmates. The a…

The Doctor and Sarah reach Earth and try to warn the research centre about the Kraal invasion before Styggron unleashes his virus.