Open coffins PN and YP in the Krypt. Clear quest mode with all the regular and hidden characters. Once that's done, hold DOWN while selecting Raiden to access Blaze. Hold DOWN while selecting Cyrax to select Mokap.
Each of the fatality moves assumes that you are standing on the left side of your opponent. Numbers 1-4 represent attack buttons 1-4. Bo' Rai Cho Belly Flop: 3(back), down, 4 Johnny Cage Brain Ripper: back, 2(forward), down, 2 Cyrax Claw Smasher: 2(forward), up, 2 Drahmin Iron Bash: back, 2(forward), down, 3 Frost Freeze Shatter: forward, back, up, down, 1 Hsu Hao Laser Slicer: forward, back, 2(down), 2 Jax Head Stomp: down, 2(forward), down, 2 Kano Open Heart Surgery: forward, 2(up), down, 1 Kenshi ETelekinetic Crush: forward, back, forward, down, 3 Kitana Kiss of Doom: down, up, 2(forward), 2 Kung Lao Splitting Headache: down, up, back, 3 Li Mei Super Crush Kick: 2(forward), down, forward, 4 Mavado Kick Thrust: 2(back), 2(up), 1 Nitara Blood Thirst: 2(up), forward, 1 Quan Chi Neck Stretcher: 2(back), forward, back, 3 Raiden Elecrocution: back, 3(forward), 3 Reptile Acid Shower: 3(up), forward, 3 Scorpio Spear Head: 2(back), down, back, 4 Shang Tsung Soul Steal: up, down, up, down, 2 Sonya Kiss of Death: back, 2(forward), down, 2 Sub-Zero Skeleton Rip: back, 2(forward), down, 3
Perform the following move when it says "Finish Him!":