Muzzy in Gondoland (1986)

A big green alien named Muzzy visits Earth where he meets a gardener named Bob who works for the palace of Gondoland. Bob is in love with the princess, except the king and queen don't favor Bob's relationship to their daughter. Corvax, the vizier who also loves the princess makes sure that Bob wouldn't stand in his way of winning the hand of the princess. It's up to Muzzy to set things right, by helping Bob get together with the woman of his dreams.