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He worked in over twenty Doctor Who stories in all, from 1971 to 1983, appearing in over 40 episodes, mostly as a stuntman or extra.
He has appeared on other British television programmes, with his earliest role being in the LWT comedy series Hark at Barker, in which he plays the driver of a car that crashes when he's distracted by Ronnie Barker carrying a mannequin.
His small size made him ideal for a number of roles- he was able to get inside a number of small, cramped costumes and even doubled for Katy Manning and Louise Jameson (wearing their costumes on both occasions!). His large range of varied skills also earned him considerable praise. In several DVD commentaries, a number of people have remarked that "he could do anything" from juggling, fire-breathing, acrobatics, stilt-walking and ride a motorcycle. As a relatively young new-comer to stunt work, he was eager to prove himself. One example was in The Claws of Axos, where he is shot and then flipped backwards on a wire rig.
He became well known within the series for a number of instances. One being when he performed an (unpaid) back flip when he died in The Sea Devils. He also had to stand in for Kevin Lindsay in The Sontaran Experiment when Lindsay's heart condition made it too difficult for him to complete his lengthy fight scene. Another notable instance was in The Invasion of Time, in which he improvised a jump (in full costume) and almost fell down as he landed on a folding chair. He then fell over a chair thrown at him to only narrowly stop himself from rolling into location's swimming pool. The whole sequence ended up being used in the final version. Stuart Fell explained, in a 2004 documentary, that he was encouraged to improvise and the it was felt that these trips made the scenes more interesting.
He played minor parts in three episodes of Blake's 7.
He appeared in television adaptations of Hamlet, The Mayor of Casterbridge and The Old Curiosity Shop. He has appeared in The Empire Strikes Back, the first two Superman films, three James Bond films,Aliens and Who Framed Roger Rabbit. Most of his film work was as a stunt man.
Fell is currently a professional juggler, is a member of The Magic Circle, and appeared on the Antiques Roadshow as an unnamed member of the public demonstrating his collection of yo-yos, diablos and other conjuring toys.
Biography from the Wikipedia article, licensed under CC-BY-SA