Location » Pocket Universe appears in 17 issues.
Once-Green Kryptonite, turned gold (possibly irradiated by nuclear explosions). It can take a Kryptonian's powers away permanently.
When Superman's native planet was destroyed, pieces of it became irradiated by the explosion, the result is Kryptonite. Contact with, or even proximity to Kryptonite can cause injury or death to Kryptonians.
A device which can transport someone to the Phantom Zone, a dreaded dimension filled with vast space, where time is frozen yet the inhabitants are not.
A time bubble can carry a small group of people through time and space. In pre-crisis continuity, the time bubble was given to the Legion of Super-Heroes by R.J. Brande. A Time bubble is also commonly used by Rip Hunter.
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