Bill Mumy Billy Bayles Actor Patricia Smith Sylvia Bayles Actor Philip Abbott Chris Bayles Actor Lili Darvas Grandma Bayles Actor Jenny Maxwell The Baby Sitter Actor Henry Hunter The Doctor Actor Reid Hammond Mr. Peterson Actor Lew Brown The Fireman Actor Robert McCord 1st Fireman Actor James Turley 2nd Fireman Actor Jutta Parr Nurse Actor Rod Serling Host Buck Houghton Producer James Sheldon Director Charles Beaumont Writer Bill Idelson Writer