Michael McWhertor of Kotaku writes:
"Mortal Kombat Vs. DC Universe's roster of "kombatants" was missing some key names on both sides. That was something series co-creator Ed Boon and the MK team had hoped to address with downloadable content, which never happened.
Boon had hinted at appearances from characters like Kung Lao and Doomsday in interviews, showing designs for one MK Vs. DC character that was planned for release, Quan Chi, first introduced in Mortal Kombat 4. The MK team lead released a render of the Mortal Kombat character via his Twitter today."