Sciencells are near inpeneterable prison cells located on the planet Oa. They are created by the Guardians of the Universe to house prisoners of the Green Lantern Corps. In their quest to bring order to the stars, it was only a matter of time before the Guardians of the Universe made many enemies. Whenever possible, the Oans did not kill their foes, they contained them. The magic wielding Empire of Tears was subjugated and imprisoned on the tombworld of Ysmault. The insect race of Tchkk-Tchkki, later known as Legion, was enclosed in an emerald forcefield around their world. The Guardians utilized one world, known only as the Guardians' Prison Planet to contain dozens of cosmic criminals. This world featured shifting time periods, and each captive was chronologically out of phase with his f