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| Stephen Boyd | Grant | |
| Raquel Welch | Cora Peterson | |
| Edmond O'Brien | Gen. Carter | |
| Donald Pleasence | Dr. Michaels | |
| Arthur O'Connell | Col. Donald Reid | |
| William Redfield | Capt. Bill Owens | |
| Arthur Kennedy | Dr. Peter Duvall | |
| Jean Del Val | Jan Benes | 
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| Producer | Paul Sawtell | ||||
| Writer | David Duncan Harry Kleiner | 
|  | The science of miniaturization has been unlocked, and the army has big plans. But when a scientist carrying the secret of the process is injured in a surprise attack, a life-threatening blood clot puts him into a coma. Now, a team of adventurers will have to use the technology to travel inside his body and destroy the clot. | 
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