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After gaining entry into Princess Eris' casino and seeing it occupied by dozens of villains from other dimensions, Princess Luna and her "Nightmare Knights" put their plan to retrieve Luna's magic from Eris into motion. However, Trixie is distracted by a "try your luck" game that offers several magical artifacts as prizes. Before Trixie gets too distracted by the game to focus on the mission, Tempest Shadowdestroys the game and causes a large scene in the casino, drawing the attention of Daybreaker.

As Tempest picks a fight with Daybreaker, the others head for the casino's upper floors but are stopped by Diamond Dog security. The Dogs growl at Capper for being a cat, but Trixie disciplines them with a rolled-up newspaper and shoos them away. On one of the upper floors, Trixie is angered to discover the casino has magic shows and did not invite her to perform. Before she storms off to try and wow the crowds, Luna appeals to her, saying she is vital to their mission's success, and asks her to stay focused.

Meanwhile, Tempest is taken into custody after her fight with Daybreaker, and Eris confronts her, believing she is part of a plan to steal back Luna's magic before the auction. Tempest is defiant to Eris' interrogating, so Eris uses Luna's magic to trap her in a nightmare illusion in which she relives a scenario similar to when she lost her horn. As Eris considers keeping Luna's magic for herself instead of auctioning it off, she leaves to hunt down the rest of Luna's accomplices and orders Daybreaker to watch Tempest.

Back on the casino's upper floors, Luna, Stygian, Capper, and Trixie are unable to proceed past Eris' royal guards. Trixie plans to distract them with an illusion, but she discovers that this dimension's Twilight Sparkle—a stage magician calling herself the "Great and Powerful Twily"—is putting on a magic show. Refusing to be upstaged by any world's version of Twilight, Trixie interrupts Twilight's show and challenges her to see who the superior illusionist is. This serves to be just the distraction that Luna, Stygian, and Capper need to get past the guards.

The path to the casino's top floor splits in two, and the team splits up, with Luna going one way and Stygian and Capper going the other way. Upon reaching the top floor, Stygian and Capper end up in a throne room, where Eris awaits to ensnare them in her trap.