Red Dead Redemption Nightmare Pack Question

Ok so I want to buy Red Dead. I check GameStop, and I see two copies. I see the original game, and the one with a zombie on the front and saying Nightmare Pack. I've read that this one comes with all the add-ons, but does it include the original game too?

It does not. The Undead Nightmare Collection is about $30 and contains the Undead Nightmare Add-on, The Legends and Killers Add-on, and the Liar's and Cheats Add-on. It contains the multiplayer component for the online content but DOES NOT contain the Red Dead: Redemption game, or at least the primary story of it.

It does not. The Undead Nightmare Collection is about $30 and contains the Undead Nightmare Add-on, The Legends and Killers Add-on, and the Liar's and Cheats Add-on. It contains the multiplayer component for the online content but DOES NOT contain the Red Dead: Redemption game, or at least the primary story of it.

MGS-Mercenary

It does not. The Undead Nightmare Collection is about $30 and contains the Undead Nightmare Add-on, The Legends and Killers Add-on, and the Liar's and Cheats Add-on. It contains the multiplayer component for the online content but DOES NOT contain the Red Dead: Redemption game, or at least the primary story of it.

MGS-Mercenary

It's like an alternate version of Red Dead. Instead of having a normal story, it has a zombie story. But still contains all the online you would find in the regular game plus the add-ons. The purpose of it, so it may seem, is to offer users a cheaper alternative to the actual Red Dead: Redemption game with all the online add-ons previously available. The add-ons would not apply to your Red Dead: Redemption game if you already have it, as the Undead Nightmare Collection is a standalone disc that has no effect or connection to your Red Dead: Redemption game. In other words, if you were looking to get add-ons for your Red Dead: Redemption game, download them, the Undead Nightmare Collection disc is COMPLETELY separate of the Red Dead: Redemption game.