Casta
Biographical information
Race	People of M7G-677
Home planet	M7G-677
Gender	Male
Out of universe information
Appearances	"Childhood's End"
Actor	Sam Charles

[Source]

Casta was a young Human child from M7G-677, a planet in the Pegasus galaxy. He was charged with showing Dr. Rodney McKay and Lt. Aiden Ford to the ruins and keeping an eye on them along with Cleo. (ATL: "Childhood's End")