Roc is a prehistoric bird (a dromornis) who is used by John, a mysterious inhabitant of the lost land where FX, Vicki and Jack went to rescue their lost friend Raye. Friendly yet dangerous, Roc was friend of John for many years, fighting against the evil General, leader of the moleisaurs. However when it wasrevealed than the subterranean lost land existed under paradoxical chronal parameters, the kids discovered than John was really a possible future of Jack, if he would had stay in this underworld. As jack left this land, the existence of Roc as his companion is uncertain.
