The fourth season of The Transformers was aired in 1987-1988. Season 4 saw many changes to the series, such as better animation, the resurrection of the Autobots who died in the movie, changes to Autobot and Decepticon leadership, and the introduction of new characters. The season, as future seasons would, borrowed many plot elements from the concurrently-running Headmasters, mainly in the form of the characters of Twincast, Soundblaster, the Trainbots, Stepper (renamed Ricochet in the US), Artfire, and the W Cassettebots (renamed the Combiner Cassettes in the US).