Founded by Queen Victoria following the events in “Tooth and Claw”, Torchwood (an anagram of Doctor Who) was an organisation devoted to the protection of Earth from alien forces. As such, there’s some overlap with U.N.I.T. Torchwood eventually got its own, eponymous spinoff show with a more grownup bite.
The Doctor abandons Rose with a genocidal Donna in Tennant-form and there’s no sign of The Shadow Proclamation anywhere!
Companions and spin-offs collide when Davros and his new race of Daleks transport the Earth far across the universe