When KO finds himself trapped inside an mysterious place, he encounters other Cartoon Network Heroes and they band together to escape.
Did You Know?
Originally One-One from the upcoming Cartoon Network show Infinity Train
(2019) was going to join the group containing Ben 10, Garnet, Raven and KO and not a stone cameo. But the creators found it to be a cheap way to promote one of the network's new shows. See more