K-9

A Time Lord’s best friend, K-9 was the robotic canine — Get it? — companion of The Doctor’s, travelling with The Fourth, Fifth and Sixth Doctors, until eventually he reappeared alongside The Tenth, was blown up, reassembled and dumped all over again to instead embark on some Sarah Jane Adventures.
Anti-body pillow fights, a fantastic voyage and the universe-threatening ejaculate of a megalomaniac space shrimp
The Doctor abandons Rose with a genocidal Donna in Tennant-form and there’s no sign of The Shadow Proclamation anywhere!
A glorious reunion with three Smiths, two tin dogs, and genetically modified gargoyles who are allergic to their own oil.