Gary Coleman plays the titular character Jimmy, a clever and resourceful kid who becomes the centerpiece of a kidnapping plot.
Don Adams portrays Harry Walker, a bumbling criminal who gets involved in the kidnapping scheme.
Paul Le Mat takes on the role of John Dortmunder, a seasoned thief recruited for the kidnapping job.
Ruth Gordon plays Bernice, a quirky and eccentric character caught up in the heist.
Cleavon Little portrays Herb, a member of the group involved in the kidnapping plan.
Fay Hauser portrays Nina, a key player in the kidnapping scheme.
Pat Morita takes on the role of Maurice, adding his unique charm to the film.
Walter Olkewicz plays Kelp, a member of the group working on the kidnapping job.
Dee Wallace portrays May, bringing her talent to the ensemble cast of characters.
Avery Schreiber plays Dr. Stevens, a character involved in the unfolding events of the film.
Bob Hoy appears as the 1st Trooper, adding to the comedic elements of the movie.
Steve Chambers takes on the role of the 2nd Trooper, contributing to the comedic performances in the film.
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