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I'm pretty sure this isn't the correct place to ask this type of question, but I don't know what would be, so I'll just answer it.
According to IMDb, Patrick Stewart's first acting role was on a show called Story Parade in 1964, when he was 24 years old. He played a character called "Jack". IMDb main page for Patrick Stewart, Link to Story Parade role
The Full Cast And Crew for The Saint at IMDb doesn't list Patrick Stewart. If he was in it, he was uncredited.
Edited by Arivne
The TV history of Patrick Stewart does not list an uncredited appearance in the Avengers This was an episode called "The Town of No Return" at the start of the episode he played a man walking from the sea. This has been mentioned in some places as being his first TV role. I however think he might have had a role as a soldier in an Episode of the Saint prior to this. Anyone got any information as to this being correct?