The Keencyclopedia
Shikadi in Space
Location
The final level on the Shikadi World. Commander Keen is beamed aboard the Shikadi Spacecraft for the showdown with the Shikadi Overlord. He'll hunt you down and blast you to smithereens with his rocket launcher, so you'd better be ready for him. Defeat the Shikadi Overlord and you will be given a plasma crystal.
Found in: Keen GBC