Dale McRaven Creator Mark Linn-Baker Larry Appleton Actor Bronson Pinchot Balki Bartolomous Actor Rebeca Arthur Mary Anne Actor Melanie Wilson Jennifer Actor Ernie Sabella Mr. Donald 'Twinkie' Twinkacetti Actor Milt Oberman Guest Star Ivan Bonar Guest Star James Gallery Dunne Guest Star John Del Regno Vince Lucas Guest Star Thomas L. Miller Executive Producer Robert L. Boyett Executive Producer James O'Keefe Producer Howard Adler Producer Robert Griffard Producer Joel Zwick Director Bob Keyes Writer