A three-part American
Transformers cartoon miniseries, substituting for what would have been a fourth season of the show.
This miniseries involves a group of Autobots and Decepticons crashing on the planet Nebulos, and discovering how to turn themselves into Headmasters and Targetmasters. (Powermasters are never explored; presumably that might have come later on, if the show had been renewed.) Also seen briefly (for about ten seconds each) are other new toys, such as Sixshot and Punch/Counterpunch.
This show is regarded as at least somewhat bad by TransFans, largely due to the habit of depicting Headmaster and Targetmaster conversions as making the robots little more than giant sentient mecha, with the pilot sitting in the head or flying a little gun-shaped spaceship around. There was also the plot device of Daniel Witwicky getting critically injured and, thus, turned into a Headmaster to survive. With Arcee.