You might remember's story: http://www.comicvine.com/forums/fan-fic/8/deadpool-kills-the-dc-universe-1-script/744027/#28
This story starts during the end of part 4. Read the rest to know what's going on.
It begins with Deadpool holding Slade at gunpoint. Slade lunges at Deadpool and tries to grab his gun. He does so but Deadpool shoots through his hand. Slade collapses to the ground clutching his wounded hand.
DEATHSTROKE SAVES THE DC UNIVERSE
Deadpool: You just don't get it, do you? I can't die! I'm basically like Krillin, but not a midget.
Slade: Damn you!
Deadpool shoves his sword in Slade's shoulder
Death appears before the two.
Death: Finish him my love. Then we can be together.
Deadpool: AWWWWW YEAH!
Deadpool holds a gun at Slade.
Deadpool: Say your prayers, bub. (imitating wolverine) ohivealwayswantedtosaythat
Slade : .......go to hell!
Slade jumps towards Deadpool and takes out the sword in his shoulder and uses it to decapitate Deadpool.
Deadpool: MEGAZORD! ACTIVATE!!!
Slade: Aww, come on!
Deadpool’s body attempts to fight Slade, but Slade slices its leg off.
Deadpool: ‘Tis but a scratch!
His body falls on the ground. Slade notices Wonder Woman’s lasso tied to his thigh. Slade tries to take it to tie him up.
Deadpool: NOBODY TAKES MY SOUVENIERS!!!
Slade sees a bomb with a timer .
Slade: Aww sh-
The bomb explodes. Slade flies several yards, his armor completely destroyed.
Deadpool: Yeah, I couldn't find a t-shirt that said "I killed the Justice League and all I got was this lousy t-shirt."
Death:...You sacrificed your body for me?
Deadpool: Of course baby! Anything for you.
Death: You've done so much for me. Now rest, while a finish him off myself.
Death raises her scythe and prepares for the final blow.
The sky turns dark. Lightning strikes Death.
The Spectre: ENOUGH!
Deadpool: Oh no. ThereZ's uh..something i forgot to tell you...
Death: You said you killed everyone.
Spectre: I CANNOT DIE! I AM THE LIVING EMBODIMENT OF VENGEANCE. AND YOU WILL FACE JUDGEMENT!
Death and Deadpool disappear. The tumor in the sun is gone and the universal cancer is fading away. Slade is waking up. The Watcher appears before him
Watcher: Congratulations, Slade Wilson. You have saved the universe.
Slade: The hell?
Watcher: If you hadn't slain him, he would have been responsible not for the death of this universe but of all universes!
Slade looks around for a moment.
Slade: No heroes and no villains. No one to push me around. Just the way i like it.
Watcher: Wrong. A new generation of heroes and villains will arise and you will be here to keep balance, Slade Wilson.
Slade: I'm no hero. I-
Hal Jordan's ring flies towards Slade's finger.
Slade: The hell?
Ring: SLADE WILSON OF EARTH. YOU HAVE SHOWN THE ABILITY TO OVERCOME GREAT FEAR. YOU HAVE BEEN CHOSEN WELCOME TO THE GREEN LANTERN CORPS.
Slade: What the f-AAAAHHHHHHHH
The comic ends with Watcher looking over Slade as he flies to the ruins of OA
Watcher : And a new age of justice begins.