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Christopher Jon Castile (born June 15, 1980) is an American former actor. His well-known roles include Ted Newton in Beethoven and Beethoven's 2nd, the voice of Zachary Sellers and Nick Mulligan in Focus on the Family's Adventures in Odyssey, Mark Foster on the sitcom Step by Step, and the voice of Eugene Horowitz in Hey Arnold!. Castile retired from acting following the cancellation of Step By Step. Wikipedia