Early versions of the game included characters from Midway's "Mortal Kombat" games.

Entity and relation annotations:
id: 0
type: entity
value: text: "Mortal Kombat"
labels: <Production>
id: 1
type: entity
value: text: Midway
labels: <Organization>
type: relation
to_id: 0
labels: Organization:develops/produces/sells:Production
from_id: 1