Commander Keen had just returned from foiling the Vorticon attack on Earth, and settled into bed, when he heard suspicious noises outside his window.
Upon dragging himself to the window and pushing aside the curtains, Keen saw some strange creatures messing around in his clubhouse.
"Here we go again," Keen thought to himself, as he raced outside to take a closer look. By the time he got outside, the creatures had left and Keen could barely make out their spaceship in the distance, flying away. Spot, of course, was no help.
Worse, Keen noticed that much of his gear, so crucial to his heroic quests, was missing. His pogo stick, his raygun, all appeared to be missing. With no time to spare, Keen decided to chase these invaders armed only with the neural stunner on board his rocket.
Keen's fortunes only continued to worsen when, having forgotten to refuel after his last adventure, his Bean-With-Bacon Megarocket ran out of fuel and he was forced to make an emergency landing in the Shadowlands. Even worse, his stunner was defective.
Unequipped and with no fuel, all Keen could do was explore in the hope he'd find some help.