American animated television series developed and produced by Rankin/Bass Productions, debuting in 1985 based on the characters created by Tobin "Ted" Wolf. The animation was provided by Pacific Animation Corporation, the working name for a collective of Japanese studios prominently including Topcraft, a group who would later go on to form Studio Ghibli. Season 1 of the show aired in 1985 (65 episodes), 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; these aired from 1987 to 1988, 1988 to 1989, and 1989 to 1990, respectively.