Commander Keen in Invasion of the Vorticons: Keen Must Die!(1990)

Description

Commander Keen's very first adventure, and the debut of id's groundbreaking side-scrolling technology. In the game you play the role of Commander Keen: the alter-ego of an eight year-old genius by the name of Billy Blaze. When Billy learns that the Earth is in danger, he dons his brother's football helmet and his homemade interstellar spa...