Manta & Moray (ep. 1) The Waters of Doom (1979)

Manta, the last of a water-breathing civilization of humans, and his female companion Moray, who had been rescued from a shipwreck and raised by a friendly dolphin. Protectors of the Seaworld!
(I loved watching it when i was a kid, and i still love it)
one of the best shows from Filmation..