While Commander Keen is exploring Mars, the Vorticon steal four vital components of his ship and hide them in Martian cities, each guarded by a Vorticon soldier. In this episode, Keen acquires his trademark pogo stick and meets a variety of Martian aliens and robots.

How long is Commander Keen 1: Marooned on Mars?
When focusing on the main objectives, Commander Keen 1: Marooned on Mars is about 1½ Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 2½ Hours to obtain 100% completion.