Aquaman: Goliaths of the Deep Sea Gorge on AllMovie

Aqualad is terrified when he confronts a fearsome-looking Gill-man (who bears a striking resemblance to the Creature from the Black Lagoon). It turns out, however, that the Gill-man is a good guy who has come to Aquaman for help. A huge and relentless Mastadon Man is destroying the Gill-people's village, and of course Aquaman agrees to swim to the rescue. Meanwhile, poor Aqualad finds himself at the mercy of the menacing Mastadon, and nearly ends up becoming a submersible shishkabob!