Episode 1 - Marooned on the Mars
 

	Yorp: These friendly, one-eyed Martians are completely harmless! They can't kill Keen directly but they can get very annoying. They have a tendency to "push" Keen along. This can cause him to fall into pits of spikes, fire, etc. They get paralyzed for few seconds if Keen jumps on them. If Keen wants to kill them: 1 shot is enough.
	Garg: These vicious, aggressive Martians are perhaps the second most dangerous creature in this episode. If Keen is on the same platform, they will charge at him at great speeds. One shot will kill them.
	Tank Robot: This robot is somewhat like a tank (look at his "feet"). The robot itself is harmless, but be careful! He carries a gun and will shoot with no hesitation. These guys can't be killed.	-
	Grunts: Grunts belong to the species of the Vorticons and are controlled by the "Grand Intellect", some mysterious being on the planet Vorticon VI. They are the most dangerous enemy in this episode because they are very intelligent - they follow Keen - and because they can jump very high. It takes 4 shots to kill them.

Episode 2 - The Earth Explodes
 

	Youths: These are perhaps the most annoying creatures in this episode. They run and jump around at high speeds and paralyze Keen if they meet. With 1 shot they are killed.
	Scrubs: These robots don't harm Keen. They climb up, down and across walls and push or "carry" Keen. They are extremely annoying most of the time but in some cases, they can help Keen out, where's no way out! 1 shot is enough to kill them but first they have to be hit.
	Grunts: This kind of Vorticon isn't less dangerous than the others. They are as intelligent and can jump as well. An important note: These guys cannot jump in the dark. But how can Keen turn off the lights...? It takes only 1 shot to kill them.
	Vorticon Warrior Elite: These warriors are the most dangerous creatures in this episode. They can run, jump and even shoot at Keen! They take 4 shots to kill.

Episode 3 - Keen must die
 

	Foob: These creatures are harmless - they are even frightened of you! When you get close to them, they get scared and run for their lives! Keen can kill them just by simply touching them.
	Meep: These Meeps are probably the worst singers the universe has ever seen. They look like small green aliens. But their "voice" or "sound waves" are deadly for Keen. Only 1 shot to kill these guys.
	Grunts: These Grunts are more dangerous than those in episode 2. They can jump as well and they aren't blind in the dark. It takes 1 shot to get rid of them.
	Vorticon Women:  The Women are pretty dangerous. It's true that they are moving very slowly and are easy to dodge but they also can fire deadly flames at Keen. They take 5 shots to get killed.
	Youths: look above
	VortiNinja: These are the most deadly enemies in this episode. Not only do they move and jump around very fast, they can also kick Keen! And to top it all off, they take 4 shots to kill.

Episode 3.5 - Keen Dreams
 

Episode 4 - Secret of the Oracle
 

	Poison Slug: The most common inhabitant of the Shadowlands. They mean trouble twice: Once if you touch them, twice if you should land in the puddles of poison they leave behind! With 1 shot Keen gets rid of them.
	Arachnut:  Insane, green, crab-walking creatures with two dangerous mouths. They are quite fast and like most to attack little man called Keen. They cannot be killed but are paralyzed a few seconds if Keen shoots at them.
	Bounder: These red, friendly, bouncing guys can be annoying because they push Keen around. They jump around and are always smiling. And they can be used as stairs! 1 shot is enough to kill them.
	Bird: These guys can fly as well as walk. Keen can shoot them but it only paralyses them temporally.
	Sneaky Rock: Keen should never turn them his back. If he does, they will sneak up and jump at Keen like a wild panther. Keen can kill them with 1 shot.
	Lick: These blue beanbag-like monsters breathe a deadly lick of fire. They are much more dangerous than their big brothers, the Bounders. To kill them, 1 shot is enough.
	Wormouth: Keen should always watch out for what creeps around. They're a lot bigger and more dangerous than they look like! 1 shot will kill them but Keen has to hit them first.
	Skypest: Virtually immune to Keen's shots, these guys are really pests. There aren't very much of them, luckily, but they are dangerous as well because they are so little. The only way to kill them is pogoing on them!
	Cloud: As soon as Keen touched it (which happens very fast because you can't see the difference between this cloud and the other, normal clouds), it gets angry and it will try to strike Keen down with their lightnings! They are immune to Keen's shots.	-
	Mad Mushroom: These dangerous plants hop and are deadly to touch but they always stay on the same place. Note: They jump higher every 3 bounces. It's impossible to kill them.	-
	Dopefish: The second dumbest creature in the universe. This creature's thought patterns on "swim, swim, hunger, swim, swim, hunger." It will eat anything alive and moving near it, though it prefers heroes. It's no use shooting it.	-

Episode 5 - The Armageddon Machine
 

Episode 6 - Aliens Ate my Babysitter
 
 

Caution: The pictures aren't in their original size and can't be compared with each other!