INTELLIVISION CARTRIDGE [ #4437]
Based on the Data East arcade game
Program: John Tomlinson
Graphics: Karen Nugent, Mark Buczek
Sound Effects: Andy Sells
An M Network Atari 2600 version was announced but never completed. APh Technology Consultants started a VIC20 version without authorization, but were informed by BP Gabriel Baum that (a) Mattel hadn't decided to do VIC20 releases and (b) if they did, Mission X would not be included.