Defenders of the Earth - Season 1 - Eps 1: Escape from Mongo
When Ming the Merciless leaves Mongo to invade Earth, his old enemy Flash Gordon and the latter's son, Rick, join forces with six others - the youngest a pre-teenaged boy named Kshin - to form the Defenders of the Earth.
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 84 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

Lou Richards
Flash Gordon (voice)

Peter Mark Richman
The Phantom / Kit Walker / 26th Phantom (voice)

Peter Renaday
Mandrake the Magician (voice)

Buster Jones
Lothar (voice)

Ron Feinberg
Ming the Merciless/Warlock (voice)

Loren Lester
Rick Gordon / Young Kurt (voice)

Sarah Partridge
Jedda Walker (voice)

Dion Williams
L.J. (voice)

Adam Carl
Kshin / Young Kit (voice)

Diane Pershing
Dynak X / Dale Arden (voice)