For other uses of this name, see Cleo (disambiguation)
Young village girl assigned by Keras to supervise Rodney McKay and the other Full Growns as they investigated ancient ruins on M7G-677. Cleo was assisted by her friend, Casta. As she admitted, she had a tendency to ramble, often testing McKay's patience. Cleo had a fondness for chocolate, which neither she nor her brother, had ever experienced before the arrival of Sheppard's team.
Cleo is three days younger than Casta.
Childhood's End - Cleo is instructed to monitor Dr. McKay and the other Full Growns as they investigate an ancient city on their planet.