X-84 Trial

The X-84 Trial is a spaceship constructed by the alt-Planet Yummy inhabitants.

According to alt-Chase, an alternate version of every one of us, besides Chase, boarded the ship and flew away from their Planet Yummy.

It is supposedly powered by the Justanium Star, the same power source used for the Yummy Machine. When the X-84 Trial crashed back on alt-Planet Yummy with the prime-timeline inhabitants, the star was split up into items called Star Fragments. Since the Yummy Machine was no longer functioning on alt-Planet Yummy when everyone arrived, it can be presumed that the alt-inhabitants removed the Justanium Star from the Yummy Machine in order to power the ship.