Park officials temporarily suspended Michael J. Fedelem while they investigate the accusations, Disney spokeswoman Zoraya Suarez said.
"Naturally, physical altercations between cast members and guests are not tolerated," Suarez said.
Jerry Monaco of New Hampshire videotaped his son, Jerry Jr., posing with the costumed character at Disney-MGM Studios on Friday and recorded the confrontation, according to a statement from the Orange County Sheriff's Office.
The father said Fedelem intentionally hit his son "on or about the head," said sheriff's spokesman Carlos M. Padilla. "The tape only shows a fraction of what happened. Now it's up to us to find out what led up to that."
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