Initially published as a commercial game between Invasion of the Vorticons and Goodbye, Galaxy! in 1991, Commander Keen: Keen Dreams was largely overlooked until it saw a shareware release in late 1992 almost a year after Goodbye, Galaxy!. It is informally known as Keen 3.5 among fans.
In Keen Dreams, Commander Keen goes to sleep and finds himself in the land of Tuberia, where he discovers that Earth children are being trapped in their sleep to work as slaves for the evil King Boobus Tuber. Out of ammo and lacking his trusty pogo stick, Keen must resort to scavenging Flower Power and Boobus Bombs from the local flora in order to combat the tuberian threat.