Mason was a Human child, born in 2355, who lived aboard the USS Enterprise-D during in the mid-24th century.
In 2364 Mason was one of several Enterprise-D children kidnapped by the Aldeans in an effort to repopulate their planet.
At the time of his kidnapping he was walking with his parents down a corridor. He later participated in Wesley Crusher's attempt at passive resistance. (TNG: "When The Bough Breaks")
Mason was portrayed by Wil Wheaton's younger brother Jeremy Wheaton.
He received no credit for this appearance.
His age is derived from the episode's script.