The characters  of ULTRAKILL are teleported into a new world after being abruptly teleported to 7-4, P-2, P-1, 0-S, and 1-4 for some reason in rapid succession.

V1 and V2 are Supreme Machines. They look the exact same, though V1 has blood-absorption qualities that lets him heal. V1 is blue. V2 is red but cannot absorb blood. This makes V2 more durable.

Minos Prime and Sisyphus Prime are Prime Souls. They exist out of sheer willpower and are extremely powerful.