ThunderCats - Season 1 - Eps 33: Dimension Doom
Wiz-Ra, Mumm-Ra's enemy from long ago, comes back every 7000 years through a portal that just happens to be in Cheetara's bedroom. Wiz-Ra wears a magical helmet that lets him control minds. When the time arrives and Wiz-Ra comes through the portal, Mumm-Ra steals the helmet. Cheetara helps Wiz-Ra get the helmet back and free the ThunderCats from its spell.
About ThunderCats

Title: ThunderCats
First Air Date: 1985-01-23
Last Air Date: 1989-09-29
Status: Ended
Rating: 8.2/10 (from 1026 votes)
Language: EN
Seasons: 5
Total Episodes: 130
Network: Syndication
Genres: Animation, Sci-Fi & Fantasy, Action & Adventure, Kids
Production Companies: Rankin/Bass Productions, Lorimar Telepictures
Synopsis
The inhabitants of the planet Thundera evacuate just before it is destroyed. They were pursued by a band of mutants. All but one of their escape ships was destroyed. Only a small group of Thunderans (Thundercats) remained. With only half engine power, the group, which was led by Jaga, had to set a course for the nearest planet. Jaga commanded their ship while the other seven were in their stasis tubes. Jaga died on their journey to Third Earth and their ship crashed there. Soon they made friends with various groups in the area and they designed a fortress. Mumm-Ra the centuries-old embodiment of evil, along with the mutants that destroyed the rest of the Thunderans are a constant threat. But Lion-O, the new leader of the Thundercats, with his weapon the "Sword of Omens" will help the Thundercats to have a standing chance.
Cast

Larry Kenney
Lion-O / Jackalman (voice)

Peter Newman
Tygra / WilyKat / Monkian (voice)

Earle Hyman
Panthro (voice)

Lynne Lipton
Cheetara / WilyKit (voice)

Earl Hammond
Mumm-Ra / Jaga / Vultureman (voice)

Bob McFadden
Snarf / Slithe (voice)

Gerrianne Raphael
Pumyra (voice)

Doug Preis
Alluro (voice)