In a special Children in Need episode, all surviving Doctors reunite to rid the universe of the Rani's threat, as she attempts to conquer the universe one Eastend at a time. Featuring a (very weird) crossover with BBC 1's Eastenders programme.
The Master returns, causing the Doctor to forfeit yet another body, in his attempt to conquer time and space. It's San Francisco, on Millienium Eve, 1999, and an amnesic Doctor requests the help of a local doctor in his battle to stop the Master from opening the Eye of Harmony and therefore gaining all of the Doctor's remaining lives...
Peter Davison, Colin Baker and Sylvester McCoy are determined to be part of the Doctor Who's 50th special using any means possible.
UNIT transport a nuclear warhead around Carbury as knights in armour show up to continue fighting a war that started thousands of years ago, but in a completely different dimension.
The Doctor and Ace take a look around King Arthur's spaceship under Lake Vortigern. Brigadier Lethbridge-Stewart shows up in Carbury where he runs into Morgaine.
The Doctor and Inspector Mackenzie try to question Josiah Smith while both Light and Control wake up from their respective slumbers.
Redvers who is still looking for the elusive Saxe-Coburg, seems to be the only person able to withstand Light and communicate with Control. Ace ends up realising that her past actions now need to be dealt with.
The Viking runes in the crypt contain offer a secret to Ace's past. Millington and Judson's Ultima machine causes problems.
St Jude's church is attacked by the Haemovores. The crazy Millington sacrifices his men. Doctor Judson dies, only to be reborn as the true evil which is Fenric himself.
The Ancient Haemovore is free once again, determined to change the future. Ace feels love for her mother for the first time.
The Doctor and Ace pay a visit to Perivale and attempt to work out why people have been disappearing. Ace is cornered by Kara, a Cheetah-Person who takes her to a far away planet.