MTV's Celebrity Deathmatch

Adam Sandler:
Enter Adam Sandler as a name in Make A Character mode.
joe kaeler.

Alien:
Successfully complete Episode 5 with a "Perfect" rank.
Wurd.

Cousin Grimm:
Successfully complete Episode 1 with a "Perfect" rank.
Wurd.

Frankenstein:
Successfully complete Episode 2 with a "Perfect" rank.
Wurd.

Gladiator Nick Dimond:
Successfully complete Episode 6 with a "Perfect" rank.
Martyr Hunter.

Mummy:
Successfully complete Episode 3 with a "Perfect" rank.
Wurd.

Wizard Johnny Gomez:
Successfully complete Episode 6 with a "Perfect" rank.
Martyr Hunter.

Wolfman:
Successfully complete Episode 4 with a "Perfect" rank.
Wurd.

Graveyard ring:
Successfully complete Episode 4 with a "Perfect" rank.
Wurd.

Spaceship ring:
Successfully complete Episode 5 with a "Perfect" rank.
Wurd.

Tomb ring:
Successfully complete Episode 3 with a "Perfect" rank.
Wurd.

Hint: Unlocking fatalities:
In Death By Elimination, there will be a series of characters. Defeat all of them and you will get your character's fatality. Complete it twice and you will get his or her second fatality.
MomDee825.

Hint: Alternate fatalities:
When certain conditions are met, each fighter can perform an alternate fatality.
Wurd.

Head Rip: Kill your opponent when they have lost both their legs.

Anvil Drop: Kill your opponent when your fighter has lost both their legs.

Matrix Decapitation Kick: Kill your opponent when your fighter has lost both their arms.

Cut off the celebrity's arms or legs to do an alternate death kill. For example, Carmen Electria has saws. Keep hitting the other celebrity with the saws and either the arms or legs will fall off. Note: Once you take off a celebrity's arms or legs, they use an attack that throws them at you. Although it does not take off too much damage, you will not be able to block the attack.
Martyr Hunter.

Hint: Marilyn Manson: Fatality:
When the game says finish him or her, press Circle + X, then Left(3). You will twist their neck for a fatality.
rogerkelly05.

Hint: Easy wins:
Play as Dennis Rodman. When the fight starts, get close to the opponent and keep pressing Triangle. The basketball should keep on hitting the opponent on the head for an easy win.
YANKEBOY52.

Glitch: Play as a Tiger and a normal character:
Start a two player game and select one of your characters as Shannon Doherty and the other character to someone from N*SYNC. Have both characters keep taunting until the power bar is full. When both are full, make the N*SYNC character use his power. Now, look at their health. It will slowly go down. When it is close, but not too close, to being empty, have Shannon use her power. This makes Shannon turn into a tiger and the N*SYNC character turn into a bunny. However when N*SYNC character's health gets to the bottom, he will transform back to his original character, which means there will be a tiger and someone from N*SYNC fighting each other. If the N*SYNC character attacks the tiger, it spins awkwardly. If N*SYNC character presses Circle, the tiger dances with you (or you rip its heart out). When Shannon's skill time wears out, the game freezes.
Jason Lambert and Rebecca Lambert.