Alex Lebeck

Alex Trebek is a game show host, most famous for the show "Jeopardy." .His character's name is Alex Lebek. He first appeared in the episode "Arthur and the Big Riddle." He later made a cameo in the episode "Elwood City Turns 100! "

Trivia:

 * He, like a lot of the actors in the series, is Canadian.
 * He also appeared in an episode of "Magic School Bus," a fellow PBS Show.