Moving his family into a revamped, scientifically advanced World War II sub, Captain Daddy attempts to prove that living beneath the sea is a safer, more normal life for his family. Too bad he’s lost the instructions.
| Actor | Role |
|---|---|
 Ed AsnerGrampa (voice) | Grampa (voice) |
| LLily HollemanJenny (voice) | Jenny (voice) |
 Fred WillardDaddy (voice) | Daddy (voice) |
 Roger BartDolphin (voice) | Dolphin (voice) |
 Richard Steven HorvitzBilly (voice) | Billy (voice) |