As the fourth doctor, he appeared in 173 episodes which aired in the years 1974 to 1981.
He also appears in the TV specials Doctor Who: Shada (1992) and Doctor Who: Dimensions in Time (1993)
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It was Tom Baker; he played the Doctor for seven years.
The 4th, Tom Baker.
Tom Baker (born January 20, 1934 in Liverpool) is an English actor who is best known for his role as the Fourth Doctor in the science fiction television series Doctor Who - a role which he played between 1974 and 1981.
In one of the episodes of the "Keys to time" series, a former school chum calls Tom Baker "Theta Sigma." The Doctor sheepishly tries to silence him while looking back & forth at the camera & his chum. Classic Tom Baker style. His real name is given in "Unfinished Business" series of online Doctor #9. It is: Chrístõdavõreendiamondhærtmallõupdracœfiredelúnmiancuimhne de Lœngbærrow - - Chrístõ to his friends. But he also has many other names.
No, they are not related.