Doctor Who - - Season 2

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

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). Features the return of classic companion Sarah Jane

A celebrated romance through time involving clockwork droids. Doctor Who - Season 2

Generally beloved for its high emotional stakes and Tennant's breakout performance. 2. The Fifteenth Doctor (2025)