There are six possible endings in Dead Rising 2: Case Zero.
The ending that the player gets will depend on Chuck's actions during his 12-hour stay in Still Creek.
NOTE: Attempting to leave Still Creek at any time without rebuilding the motorcycle will trigger a cut scene in which Chuck will say that he can't leave Katey behind. All endings except F require that Katey gets her Zombrex.
Requirements: Katey must be given her Zombrex, the bike must be fully rebuilt and you must successfully escape Still Creek in time.
Chuck successfully rebuilds the motorbike and navigates through the town, now overrun with troops. After his escape, he reunites with his truck where the thief is inside, dead. Chuck retrieves his stuff, including his signature jacket and several Zombrex boxes before getting back on the bike. He reminds Katey how important it is that she is kept safe before they both ride into the sunrise.
If you get this ending, you get 15,000 PP. This is the canon ending.
Requirements: Katey must be given Zombrex and the bike must be completely rebuilt, but Chuck must fail to escape from the military and Still Creek in time.
Katey will be taken into quarantine by the military while a resisting Chuck will be knocked unconscious by a soldier after screaming at them to let her go. If you get this ending, you get 10,000 PP.
Requirements: Katey has to be given Zombrex and the bike must be completely rebuilt. However, you must not get on the bike before 9:00pm.
The same cut scene as Ending B plays. If you get this Ending, you get 5,000 PP.
Requirements: Katey has to be given Zombrex, but the bike must not be completely rebuilt.
The same cut scene as Ending B plays. If you get this ending, you get 2,000 PP.
Requirements: Katey has to be given Zombrex, but Chuck must not have returned the garbage cart containing the motorcycle to the safe house.
The same cut scene as Ending B plays. If you get this ending, you get 1,000 PP.
Requirements: Do not give Katey her Zombrex.
Depending on where you are at 8:00pm, one of two cut scenes will play. If you are outside the safe house, Chuck's watch beeps, he notices he's too late, before dropping to his knees and repeating Katey's name helplessly. If you are in the safe house, the scene will show Chuck entering the safe house, calling out to Katey. Realizing what's happened, he breaks down crying and pounds his fist in the ground.
If you get this ending, you get 0 PP.