M.A.S.K. stands for Mobile Armored Attack Kommand.
The Volcano converted from All-Terrain Van into a high-rise tracker vehicle. The set featured Matt Trakker and Jacques LaFleur as pilots w/masks, vehicle w/accessories, poster and instructions for conversion.
Collector's Note: The version of Matt Trakker that comes with the Volcano differs from both versions that comes with the Thunderhawk and the Rhino.