Young village boy assigned by Keras to supervise Dr. Rodney McKay and the other Full Growns as they investigated ancient ruins on M7G-677. Casta was assisted by his friend, Cleo. Thanks to Lieutenant Aiden Ford, both children discovered they had a fondness for chocolate, which they had never experienced before the arrival of John Sheppard's team.
Casta is three days older than Cleo.
Childhood's End - Casta is instructed to monitor Dr. McKay and the other Full Growns as they investigate an ancient city on their planet.