Green Lantern, Vol. 2

"Menace of the Atomic Changeling" - Tomar-Re has come to Earth, asking for help. An atomic powered changeling has arrived, and it's systematically duplicating everything and everyone it sees, leaving behind a wake of comatose victims.

"The Elixer of Invulnerability" - Hal won a Ferris Air employee lottery, and is sent to Hawaii on vacation for a week. While there, he runs across a man who has created an elixir of invulnerability, and finds himself unable to harm the super criminal.