Rick Moranis (Wayne Szalinski), Marcia Strassman (Diane Szalinski), Robert Oliveri (Nick Szalinski), Lloyd Bridges (Clifford Sterling), Daniel Shalikar (Adam Szalinski), Ron Canada (Marshal Brooks), John Shea (Dr. Charles Hendrickson), Keri Russell (Mandy Park), Gregory Sierra (Terence Wheeler), Lisa Mende (Labortechnikerin), John Paragon (Labortechniker), Michael Milhoan (Captain Ed Myerson), Kenneth Tobey (Smitty), Bill Moseley (Bundesmarshal), Alex Daniels (Onkel Yanosh), Leslie Neale (Constance Winters), Amy O'Neill (Amy)