Golion

Golion aka Hundred Beast King FiveLion (百獣王ゴライオン - Hyakujūō Goraion) became the basis of the show Voltron (III). The first series featured a team of five young pilots commanding five robot lions, which could be combined to form Voltron. In this era, the Voltron force was in charge of protecting the planet Arus (ruled by Princess Allura) from the evil King Zarkon, his son Lotor, and the witch Hagar, who would create huge Robeasts to terrorise the people of Arus. (This storyline is similar to those of the Toei Super Sentai shows, which formed the basis for Mighty Morphin Power Rangers.) Despite being the first of the two robots to appear on American television, Golion's version of Voltron was regarded as Voltron III in the toyline, most likely because of it's distance from Earth (adapted from Wikipedia)