The show was focused on a group of warriors assembled by Raiden (spelled Rayden in the series) to defend Earthrealm from invaders who entered through portals from various other dimensions. The assembled warriors included Liu Kang, Stryker, Sonya Blade, Jax, Kitana, and Sub-Zero, with Nightwolf functioning mostly as tech support but still entering the fray on various occasions. The warriors operated out of a hidden base from where Nightwolf and Rayden monitored portal openings; the warriors would fly dragon-shaped jets to deal with disturbances. Shao Kahn was something of an archvillain throughout the series despite appearing in only four of the series’ thirteen episodes, being responsible for allowing other realms to invade Earthrealm.
The characters and their backgrounds were mostly continuous with the movie and Threshold’s representation of the series canon, though many original characters exclusive to the program were introduced and some elements of Mortal Kombat 3 were included. The episode plots themselves shared little relation with that of any of the games, though the character designs are based on their MK3 and Ultimate Mortal Kombat 3 sprites (except for Kitana, whose design looks like a blend of her MKII and her UMK3 looks). Kung Lao, Johnny Cage, Mileena, Sindel, Goro and Kintaro were not shown or referenced in the show at all, while characters based on Reptile, Baraka, and Jade were featured. The finale involved Kitana leading a rebellion from Outworld against Kahn. The most notable aspect of the show was that it provided the debut of Quan Chi, who would go on to become a major antagonist in the game series.