This game was a big win for me and my team - it was the first time the MK team trusted an outside team (us) to handle primary character creation. (Technically the second if you count the Dragon King and Goro I created for Deception on the Wii.)
Raiden and Baraka were the first characters we created. The team's art director liked them enough to add more primary characters to our schedule.
We also created the Batcave, the Watchtower, Shang Tsung's Palace, and other environments and prop assets.