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Sliders seems to be the only TV show John Rhys-Davies has walked away from. He has limited experience with television; he has done mostly voice-overs for such shows as Gargoyles and The Fantastic Four. Of course, he has a very varied movie career and will next be seen in Lord of the Rings.
He had a role in the short lived show, You Wish, about a Genie. His character in that show was Madman Mustapha. If you wish to know more about John Rhys-Davies, check out his page on the IMDB.