The Phantom Superboy
A cache of Kryptonian weapons, including a Phantom Zone Projector, falls to Earth. Superboy learns of the Phantom Zone’s existence and how Kryptonian criminals were sent into it by a mental playback device in a helmet from the weapons cache. A lizard accidentally triggers the projector and sends Superboy into the Phantom Zone, but he manages to telekinetically write a message to Jonathan Kent on an electric typewriter. Jonathan finds the projector and releases Superboy from the Zone.