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 characters from Class of 3000
(2006) and The Secret Saturdays
(2008) were also going to have stone cameos. But couldn't be put in due to the running time. Creator Ian Jones-Quartey
even apologized on his Twitter account for not adding any characters from those shows because of this. See more