Voice actor for Charlie Brown arrested in Calif.

(AP) The man who was the voice of Charlie Brown on many Peanuts television shows has been charged with stalking and threatening his former girlfriend and a plastic surgeon who gave her a breast enhancement he apparently didn't like.

Peter Robbins pleaded not guilty Wednesday in San Diego Superior Court.

Robbins was arrested Sunday at the San Ysidro Port of Entry after authorities doing a background check upon his return from Mexico spotted a warrant from the San Diego County Sheriff's Department.

Prosecutors say the 56-year-old stalked and threatened his former girlfriend, as well as the plastic surgeon. Authorities say Robbins paid for the breast enhancement.

He is being held on $550,000 bond.

Robbins was the voice of Charlie Brown on A Charlie Brown Christmas and other TV specials.