Future DLC for MK1 supposedly would have brought back five Mortal Kombat characters from the past along with one new guest fighter.

Alongside more story expansions, that cancelled DLC reportedly included a third Kombat Pack, which would have added six more characters to the game. As pointed out by Twitter user

According to a supposed leaker, NetherRealm might be scrapping its plans for a third year of Mortal Kombat 1 DLC, including a new story campaign.

A high-profile insider has claimed that all future MK1 plans with DLC have been canceled after the Khaos Reigns expansion underperformed.

This comes from Mortal Komber leaker FateUnknown, who has shared details that have proven to be accurate in the past. Now, they're claiming that planned DLC for Mortal Kombat 1 ha

A known leaker has claimed that initially planned Mortal Kombat 1 DLC is now canceled. This included another Kombat Pack and a second story expansion. They state the reasoning behind this move is due to its previous expansion’s poor sales.