Phantom Zone Generator

History
Phantom Zone Generator (or PZG) is a device which can open a portal to the Phantom Zone. Every colony ship had one and Superman had it in his Fortress of Solitude.

Usage of it was deserved only for the worst Kryptonian criminals. It was used to imprison Doomsday.

In January 2017 Task Force X stole it from Superman and it is now in the Black Wing of Arkham Asylum.

Trivia

 * After JLA disbandment Batman started experimenting with his own PZG.