Flint and Lade Jaye are sent to Scotland to investigate the material used to make the Terrordrome, which leads back to M.A.R.S. and Destro.
While there Destro finds an impostor took his place and must team with the Joes to get his rightful place back. In exchange he agrees to give them the plans to the Terrordrome.
First mention of M.A.R.S.
First appearance of Mainframe.