Season 12

Season 12 of Doctor Who aired between December 1974 and May 1975. This season stars Tom Baker as the Fourth Doctor, Elizabeth Sladen as Sarah-Jane and Ian Marter as Harry. This season is considered by many fans of the Classic Series as the start of the show's Golden Age.

Overview
This season was a break from form in several ways. Finally freed from the shackles of UNIT, the Fourth Doctor promptly leaves Earth, despite the huge number of alien incursions that had taken place there over the last few years. Companions Sarah-Jane and Harry tag along for the ride, and the trio become embroiled in a Season Arc, a first for the series. Each story in the series is interconnected, an idea which would eventually carry over to the New Series and almost destroy the show forever. Even so, this season is considered to be among the best in the show's history for good reason - there are many classic Classic Series stories in this season.

Episodes

 * Robot
 * The Ark in Space
 * The Sontaran Experiment
 * Genesis of the Daleks
 * Revenge of the Cybermen