Thrown into uncharted lands, Shovel Knight faces mysterious adversaries in the form of robotic forces. Cuphead shows up to lend a hand, though not without brewing up a brawl first. Meanwhile, Frisk wreaks havoc on their journey, pulling the Knight as well as Madeline into the fray, all of whom unite with a lead that might take them back home.
Shovel Knight, Cuphead, the Knight, and Madeline join forces with a "robot" named Charlotte, who tasks them with taking down a Rogue in order to go home, leading them to a cybernetic metropolis. Niko joins in the chaos while the Drifter and the Beheaded clash with a powerful opponent. Elsewhere, Frisk's morality is tested as they face Springtrap.