The Herculoids - Season 1 - Eps 26: Attack of the Faceless People
The princess Serena of the Sun People arrives on Amzot, being pursued by Darkon of the Faceless People. Darkon wants Serena so he can control her people. The Herculoids successfully drive him off, but not before he captures Tara. Zandor agrees to a trade, but substitutes a berobed Gleep for Serena and they destroy Darkon's palace from the inside.
About The Herculoids

Title: The Herculoids
First Air Date: 1967-09-09
Last Air Date: 1968-01-06
Status: Ended
Rating: 7.2/10 (from 23 votes)
Language: EN
Seasons: 2
Total Episodes: 36
Network: CBS
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy
Production Companies: Hanna-Barbera Productions
Synopsis
Somewhere out in the deep space live the Herculoids. Humanoid Zandor, along with his wife Tara and son Dorno, lead a group of unique creatures: Zok the flying dragon, powerful simian Igoo, rhinoceros hybrid Tundro and two protoplasmic wonders named Gloop and Gleep. Together, they use their diverse super strengths to defend their utopian planet against attack from sinister invaders.
Cast

Don Messick
Gloop / Gleep

Virginia Gregg
Tarra

Mike Road
Zandor

Sparky Marcus

Ted Cassidy

Ted Eccles
Dorno