After recovering a giant oyster, two explorers are captured by Troy in restricted waters.
| Actor | Role |
|---|---|
 Don MasonCaptain Troy Tempest (voice) | Captain Troy Tempest (voice) |
 Robert EastonLieutenant George Lee 'Phones' Sheridan / Chick Kingsland (voice) | Lieutenant George Lee 'Phones' Sheridan / Chick Kingsland (voice) |
 Ray BarrettCommander Sam Shore (voice) | Commander Sam Shore (voice) |
 Lois MaxwellLieutenant Atlanta Shore (voice) | Lieutenant Atlanta Shore (voice) |
 David GrahamMike Bromley (voice) | Mike Bromley (voice) |