Inmates Ram Crowder and Silky Martin find a magical lamp which grants them three wishes, including freedom, though not riches. But Ram is OK with that because he stashed the stolen money from his last job...which is Silky's cue to reveal this was all a sting to get Ram to reveal the location of the money.
Men are compelled to create a cannon for a being claiming to be a moon-dweller, supposedly to send him back to the moon, but the moon-dweller is really a mole-man and the cannon is to send him back into the Earth. Once accomplished the men seal the hole in the ground so he can't return.
Dr. Hargate discovers how chameleons change color and gives himself the same abilities in order to commit crimes. But he doesn't realize he has a color-blind neighbor who can spot him.