Yes you can but you must beat the final mission by killing Reyes and then putting the green mask back in the tomb. Years after the Marston family dies, a crazy old guy takes the mask back which brings back all the Zombies, including you. The outfit is called Undead Outfit and you can also get Undead Hunter outfit but you need to do 6 challenges to unlock it.
Undead nightmare pack
No, in undead nightmare you basically kill zombies and do zombie missions
yes can but one of you has to be the zombie.
You can't play coop on Red Dead Redemption or Undead Nightmare.
No because Undead Nightmare is essentially a whole different game. You can only play as his son Jack at the end of the regular Red Dead Redemption.
its on Undead Nightmare
No, if you buy the one for 20 dollars that is undead nightmare but not the original. The only way to get both is buy the Original Red Dead Redemption and then buy the Undead Nightmare add-on
Only if you want to download the game, if you buy the undead nightmare disc the no you don't need the original red dead redemption.
nothing the town will become zombie infested
Well, you can get Undead Nightmare into the Red Dead Redemption disc if you download it from the PlayStation Store.
You have to get in a fight with them.
No it is a stand alone disc that allows you to play the Undead Nightmare DLC without Red Dead Redemption