Filename: Commander Keen 3.dos
Name: Commander Keen: Episode 3 - Keen Must Die!
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 third episode, Keen journeys to the Vorticon homeworld of Vorticon VI to find the Grand Intellect. He travels through Vorticon cities and outposts to gain access to the Grand Intellect's lair, fighting mostly against the Vorticons themselves. Upon reaching the lair, he discovers that the Grand Intellect is actually his school rival Mortimer McMire, whose IQ is "a single point higher" than Keen's. Keen defeats Mortimer and his "Mangling Machine" and frees the Vorticons from mind-control; the Vorticon king and "the other Vorticons you haven't slaughtered" then award him a medal for saving them.