Amazing Adventures #2 (1961)

A high school student comes across a crashed alien ship and the creature lying nearby tells him that he is pursuing a criminal named Manoo who endangers all of Earth. He tells the lad he is too weak to carry on the hunt and gives him a ray gun to blast him with. Manoo is a shape-shifter but he can be discovered by noticing that he will not cast a shadow in his disguise. The boy finally checks a theater and discovers Manoo. He finds that he can't just gun the alien down in cold blood despite how dangerous he may be. When he explains everything to Manoo, Manoo tells him that he's been tricked, and the criminal he's been pursuing was the one at the crash site. The boy goes along with his plan to take Manoo back to the crash site supposedly under guard so he can stand trial on his home world. When he returns, the first alien is angry the boy did not shoot Manoo and he and Manoo begin to battle. The boy is undecided on who he should aid until the first alien grabs him and threatens his life if Manoo does not capitulate. The boy escapes his grasp by grabbing a low tree branch and Manoo defeats the criminal alien. Before departing Earth, Manoo rewards the boy with a huge gemstone, making the formally impoverished student very wealthy.