Filename: Commander Keen 1.dos
Name: Commander Keen: Episode 1 - Marooned on Mars
Rating: unknown
Released: 1990
Developer: Ideas from the Deep
Publisher: Apogee Software
Genre: Platform
Players: 1
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Commander Keen in Invasion of the Vorticons is a three-part episodic side-scrolling platform video game developed by Ideas from the Deep (a precursor to id Software). 
In the first episode, eight-year-old child Billy Blaze builds a spaceship and puts on his older brother's football helmet to become Commander Keen. One night while his parents are out of the house, he flies to Mars to explore, but while away from the ship the Vorticons steal four vital components and hide them in Martian cities. Keen journeys through Martian cities and outposts to find the components, despite the efforts of Martians and robots to stop him. After securing the final component, which is guarded by a Vorticon, Keen returns to Earth—discovering a Vorticon mothership in orbit—and beats his parents home, who discover that he now has a pet Yorp.

