Space Cadet
Platform: Intellivision
Region: USA
Media: Cartridge
Controller: INTV
Genre: Action 
Gametype: Prototype
Release Year: 1982
Developer: Mattel
Publisher: Mattel
Players: 1
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The looniest space battle ever. Each team is in command of a decrepit flying saucer that seems to work best as a battering ram. It's outer space demolition derby!
President Josh Denham and the other senior staff were enthusiastic about the concept, but instead of six separate games, they decided that the Party Line would be perfect for the new multi-game album concept. Three of the games -- Blow Out, Hard Hat and Space Cadet -- were chosen for the cartridge. The Party Animals would appear on the title screen.
The project was delayed in July 1983 when Josh Denham was replaced by Mack Morris. Morris's right-hand man, Jeff Rochlis, didn't like the Party Line, and expressed doubt that there was any market for it. He had Marketing do extensive testing; luckily the results were positive and the cartridge was back on track. An M Network Atari 2600 version of Blow Out was even ordered.
The three games were completed and shown with a title screen by Monique Lujan-Bakerink at the January 1984 Consumer Electronic Show. They were well received, but Mattel Electronics closed two weeks later.
Despite the fact that the games were done, INTV Corp. chose not to release them. For the post-crash market, INTV President Terry Valeski felt only one-player games were viable.

http://intellivisionlives.com/bluesky/games/credits/1984b.html#party_line