Features the return of classic companion Sarah Jane Smith and K9 .
The "Torchwood" arc, which leads to the creation of the spin-off series Torchwood . Key Episodes: Doctor Who - Season 2
A celebrated romance through time involving clockwork droids. Features the return of classic companion Sarah Jane
This is arguably the most famous Season 2, marking first full year as the Tenth Doctor . It is defined by his romantic and protective relationship with companion Rose Tyler (Billie Piper). Doctor Who - Season 2
The emotional finale where the Daleks and Cybermen go to war, leading to the heartbreaking permanent separation of the Doctor and Rose.