Maxwell Perry Cotton as Dennis Mitchell

Robert Wagner as George Wilson

Louise Fletcher as Martha Wilson

Isaac Durnford as Jack Bratcher

Kim Schraner as Alice Mitchell

George Newbern as Henry Mitchell

Jake Beale as Joey

China Anne McClain as Margaret

Heidi Hayes as Gina

Marie Matiko as Mrs. Walsh-Mellman

Jack Noseworthy as David Bratcher

Richard Dumont as Mr. Peeves

Godfrey as Bob / Santa

Guido Cocomello as Neighbor

Michael Lerner as Mr. Souse

Jane Gilchrist as Stuffy Woman

Russell Yuen as Police Officer Wong

Elliott Larson as Georgie

Walter Massey as Wilbur Newman

Matthew Comeau as Future Boy

Richard Notkin as Old Dennis

Mason Cotton as Futuristic Boy (uncredited)