Peter Robbins, 56, was charged with 12 felony counts of making criminal threats and stalking. He pleaded not guilty during an arraignment hearing Wednesday.
U.S. Customs and Border Protection agents arrested Robbins Sunday at the San Ysidro Port of Entry. Prosecutors say he was stalking his ex-girlfriend and made criminal threats against a La Jolla plastic surgeon.
Robbins was the voice of Charlie Brown for TV specials, "A Charlie Brown Christmas" and "It's the Great Pumpkin, Charlie Brown."
He is being held on $550,000 bail. He faces up to nine years in state prison if convicted. A preliminary hearing has been set for March 22.
