Saints Row IV: Enter the Dominatrix reimagines the Zin invasion to be much more... punishing.
Back before THQ went under, Volition had been working on Enter the Dominatrix as a DLC expansion to Saints Row: The Third. When the planned expansion grew too ambitious and the game's publisher collapsed, the idea was scrapped, only to be spun into the main plot of Saints Row IV. Not everything in the DLC made it into the new game, though, so as of today Enter the Dominatrix is available as a $6.99 DLC-turned-game-turned-DLC again for Saints Row IV.
The expansion reboots the plot of Saints Row IV, keeping some ideas while twisting others into something even weirder. The Zin invade Earth and trap the Saints in a virtual Steelport, just like before, but this time around the virtual world is controlled by an insane AI called the Dominatrix, who rules pseudo-Steelport with a leather fist. Players will get some new toys and team up with old friends like Zimos the auto-tuned pimp to stop the Dominatrix and her army of sex workers.
Enter the Dominatrix is free for those who purchased the Saints Row IV season pass. The season pass will also include the game's other major expansion, How the Saints Saved Christmas, which is due for a release later this year (no points for guessing when).