Cooler is kidnapped by Fu where he is then brought to his created Prison Planet to unwillingly take part in his experiment. When Future Trunks wakes up in his cell, the doors open up for him allowing him to leave. As Trunks heads out into the Slum Area, he soon runs into Cooler in his final form who demands that Trunks hand him over one of the Special Dragon Balls that are needed to escape the planet though Trunks is not in possession of any.