- Jack Ryan as Arthur
- Dr. Caroline Catherine Ryan as D.W.
- Kevin O'Donnell as Buster
- Sean Miller as Rattles
- Sally Ryan as Francine
- Lord William Holmes as George
- Rose as Muffy
- Lieutenant Commander Robby Jackson as Mr. Haney
- Annette as Jane Read
- Marty Cantor as Mr. Ratburn
- Vice Admiral Jim Greer as Bud Compson
- Paddy O'Neil as Brain
- Dennis Cooley as David
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