Filename: Commander Keen 2.dos
Name: Commander Keen: Episode 2 - The Earth Explodes
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 second episode, the Vorticon mothership has locked its X-14 Tantalus Ray cannons on eight of Earth's landmarks, and Keen journeys to the ship to find and deactivate each of the cannons. Keen does so by fighting more varied enemies and hazards and a Vorticon at each cannon's control. At the end of the episode, he discovers that the Vorticons are being mind-controlled by the mysterious Grand Intellect, who is actually behind the attack on Earth.

