Hal Jordan faces the sins of his past (or future, as the case may be). It's Hal Jordan vs. Parallax, with Kyle Rayner stuck in the middle!
Hal battles Parallax in defense of Kyle, Parallax pleads with Hal to return to his time so that he can ensure his creation, Hal refuses and lashes out with his powers. He apparently defeats Parallax and rushes to Kyle’s side. Parallax then teleports them all through time right to a second before coast city was destroyed. He shows Hal the bombs descending as they walk through coast city as time stands still. Hal is scared of becoming parallax thus he continues to refuse to go back.
They fight until Kyle jumps in and tells them both that time is in danger unless they all go back to when they are supposed to. They all reluctantly agree none more so than Hal. He hugs Kyle goodbye and give him something. They then lock rings as Hal’s ring erases there memories and Parallax send them all back to their proper time. As they leave coast city is annihilated.
Parallax arrives in the past to knock superman out, Hal defeats Sinestro on his own and Kyle tells the whole thing to Jenny. After they talk he reveals what Hal gave to him. An old school Green Power Ring.