S1·E20 TROUBLE! Rahanimu, The Furious Fish Man!

Reciting numerous incantations for self-defense, Lina and her friends manage to defend Rezo's fierce attack. Rezo's powerful black magic destroys half of the town, yet our heroes manage to escape. They must find a way to destroy Rezo. They head for the institute where Rezo used to experiment with his magic. Rezo is still not fully recovered and needs rest. He sends Rahanimu, a monster that is half-human and half-fish, to stop our heroes. Lina and her friends battle with Rahanim who is accompanied by Zangulus. Zelgadis uses his smarts to defeat Rahanimu and our heroes get out of a pinch. They finally reach Rezo's institute.