The Return of Convoy toyline was introduced in Japan in 1991 as a continuation of the main Generation One toyline. The lineup consisted of 16 sets, all Autobots. All except Grandus and Sixliner came with a Micro Trailer. The W Teams were made up of two pairs of Micromaster Combiners, as opposed to the three pairs included with the US Combiner Squads.("W" for "double"...get it?)