ThunderCats is an American animated television series that was produced by Rankin/Bass Productions debuting in 1985, based on the characters created by Tobin “Ted” Wolf. The series, for which Leonard Starr was the head writer, follows the adventures of a group of cat-like humanoid aliens. The animation was provided by Japanese animation company Pacific Animation Corporation whose artists later went on to join Studio Ghibli. Season 1 of the show aired in 1985, followed by a TV movie entitled ThunderCats – HO! in 1986. Seasons 2, 3, and 4 followed a new format of twenty episodes each, starting with a five-part story.