Rellim Ohcanep is a realm from Mortal Kombat, referenced in Mortal Kombat 3, Ultimate Mortal Kombat 3, and Mortal Kombat Trilogy, upon winning 100 straight matches in two player mode. This feat brought the victorious player to a black screen claiming that they were entering the realm of Rellim Ohcanep. This would then treat them to a game of Galaga. Rellim Ohcanep is supposedly the realm where this game takes place.
While it has not yet been a canon part of the storyline, it was stated as a realm in-game and thus should be kept in mind when including a list of all Mortal Kombat realms.
The realm's name is "Penacho Miller" spelled backwards, with Penacho and Miller being two members of the development team.