The twelfth season of the British science fiction television series
Doctor Who began on 28 December 1974 with Tom Baker's first serial
Robot, and ended with Revenge of the Cybermen on 10 May 1975.This is
the first season to feature Tom Baker as the fourth incarnation of the
Doctor, an alien Time Lord who travels through time and space in his
TARDIS, which appears to be a British police box on the outside. He is
accompanied by companions Sarah Jane Smith (Elisabeth Sladen),
continuing from season eleven, and Harry Sullivan (Ian Marter), who
joins in this season.During production of season eleven, it was known
that Jon Pertwee would be leaving his role as the Third Doctor and
that a new Fourth Doctor would need to be cast for the part. Tom Baker
was an out-of-work actor, working in construction at the time. Baker
had been a television and film actor, having major parts in several
films including The Vault of Horror (1973) and as the main antagonist
in The Golden Voyage of Sinbad the same year. He had written to Bill
Slater, the Head of Serials at the BBC, asking for work. Slater
suggested Baker to Doctor Who producer Barry Letts who had been
looking to fill the part. Letts had been the producer of the series
since the early Pertwee serials in 1970. He had seen Baker's work in
The Golden Voyage of Sinbad and hired him for the part. Baker would
continue in his role as the Doctor for seven seasons, longer than any
other actor to play the part. Doctor Who (season 12) Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter