Defenders of the Earth - Season 1 - Eps 54: The Return of Doctor Dark
Ming sets out to rule the entire universe by stealing the first of the three shards of the Orb of Konos from the Yucatan rain forest. At Monitor, Mandrake picks up telepathic signals from Mara, prompting Rick's journey to the Well of Essence, where he finds her in a cocoon. Dr. Dark locates the second shard with Ming, but in a confrontation between the two the evil ex-shadow lord drains the crystal's power, capturing it in his own body. Flash and Mandrake travel to a frozen planet to recover the third shard, only to discover that Ming has beat them to it. Back at Monitor Mara emerges from her cocoon, now a shadow lord. The Defenders rush to the Amber Keep on Rylos --the only place where the Orb of Konos can be reassembled- to discover that Dr. Dark has double crossed Ming and entered the Shadow Void to become the supreme ruler of the universe. Mara enters Dr. Dark's mind and prevents him from regaining control, thereby allowing the Orb to take back the power he stole from it, and destroying the evil warlock in the process. The Defenders escape the planet and Mara stays to become the new shadow master, ensuring that no one ever again splits the Orb of Konos.
About Defenders of the Earth

Title: Defenders of the Earth
First Air Date: 1986-09-08
Last Air Date: 1986-12-05
Status: Ended
Rating: 7.5/10 (from 83 votes)
Language: EN
Seasons: 2
Total Episodes: 65
Network: Syndication
Genres: Animation, Action & Adventure
Production Companies: Marvel Productions, King Features Syndicate
Synopsis
Defenders of the Earth is an American animated television series produced in 1986, featuring characters from three comic strips distributed by King Features Syndicate—Flash Gordon, The Phantom, and Mandrake the Magician—opposing Ming the Merciless in the year 2015. Supporting characters include their children Rick Gordon, Jedda Walker, Kshin, Mandrake's assistant Lothar, and Lothar's son L.J. The show lasted for 65 episodes; there was also a short-lived comic book series published by Star Comics, created by Gerry Conway, Ross Andru and John Romita, Sr.. The closing credits credit Rob Walsh and Tony Pastor for the main title music, and Stan Lee for the lyrics. The series was later shown in reruns on the Sci Fi Channel as part of Sci Fi Cartoon Quest.
Cast

Buster Jones

Peter Mark Richman

Loren Lester

Peter Renaday

Sarah Partridge

Lou Richards

William Callaway

Hal Rayle

Ron Feinberg

Diane Pershing