Force Five : Grandizer (1981)

Compilation film by Jim Terry "Will the merciless Vegan Empire destroy the planet Earth? Only one man can protect his adopted homeland from the Vegan's ruthless cunning, none other than Orion Quest and his starship GRANDIZER Narrowly escaping the Vegan's anihilation of the peaceful planet Antares, Quest guides his space robot GRANDIZER to Earth, where he is befriended by Professor Valconian, who hides his massive machine and helps Quest adopt a new identity as an earthling. Upon learning of the planned attack by the evil Vegans, Quest and his GRANDIZER ship come out of hiding to protect his new home from the vicious onslaughts. Electrifying interstellar excitement at its best. Never before has a feature-length cartoon produced such top action science-fiction entertainment." - Back of the VHS cover description