Voltron is a shape-changing giant mecha robot first featured in the 1980s animated television series Voltron, Defender of the Universe. There has since been a second series, made in the 1990s using CGI techniques. The 1980s Voltron series was based on two vaguely-related Japanese anime series (both originally produced by Toei Animation & Bandai, who also produced the popular Super Sentai series in Japan). The anime was dubbed and strung together by North American television production and distribution company World Events. The series was not a straight dub, however, as much of the violence of the original Japanese series was removed (among other things).
There were plans for yet another Voltron, which would have been based on the series Light Speed Electric God Albegas (光速電神アルベガス - Kōsoku Denjin Arubegasu). This series would have featured three smaller humanoid robots, named alpha, beta and gamma. That combined to form one larger robot aka Voltron. It was based in mountain base, and wielded a sword like the other Voltrons. Due to the strong popularity of the Lion Voltron, the unenthusiastic response to the Vehicle Voltron and Albegas' lack of popularity in Japan, World Events Productions, (the St. Louis, Missouri based company who owns the rights for both Voltron series) ultimately decided against another alternate Voltron series. Matchbox released a toy of Gladiator Voltron labeled Voltron II, in addition to Voltron I (Vehicle Voltron) and Voltron III (Lion Voltron).
To appease fans who wanted to see a spawned feature from the Voltron II toy, Gladiator Voltron made a brief, one-panel appearance in the Devil's Due comic in 2004. (Wikipedia)