In many ways, Baker shares in helping shape the show fans enjoy today, paving the way for its longevity.
Tom Baker starred as the Fourth Doctor on Doctor Who for seven straight years from 1974 to 1981, which makes him a record-holder as the actor with the longest running stint in the role, per IMDB.
He contributed to the character for nearly a decade, and was it not for his dedication, who knows what would have happened to the series.