Atlanta is visiting an undersea fish farm run by Professor Cordo when he takes her hostage in a scheme to capture Stingray. Troy, Phones, and Marina must work to get the vessel back and rescue Atlanta before they run out of oxygen.
| Actor | Role |
|---|---|
 Don MasonCaptain Troy Tempest (voice) | Captain Troy Tempest (voice) |
 Robert EastonLieutenant George Lee 'Phones' Sheridan (voice) | Lieutenant George Lee 'Phones' Sheridan (voice) |
 Ray BarrettCommander Sam Shore / Sub-Lieutenant John Horatio Fisher / Grupa (voice) | Commander Sam Shore / Sub-Lieutenant John Horatio Fisher / Grupa (voice) |
 Lois MaxwellLieutenant Atlanta Shore (voice) | Lieutenant Atlanta Shore (voice) |
 David GrahamProfessor Alexander Cordo / Noctus / Weather Station 7 (voice) | Professor Alexander Cordo / Noctus / Weather Station 7 (voice) |