Celebrating Commander Keen's 20th anniversary

After 20 years of Commander Keen, we look back at the history of id Software's classic series

The first episode of Invasion of the Vorticons, titled Marooned on Mars, saw four vital components of Commander Keen's spaceship stolen by Vorticons and hidden in different Martian cities. Keen's mission is to find each component, rebuild his spaceship and get home before his parents.

Image credit: the Commander Keen Wiki at Shikadi.net.

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