Matthew Gore is an intelligent boy chosen by a mysterious extraterrestrial visitor to be a source of information about life on Earth. As his schoolwork and artistic talent improve dramatically he arouses the suspicion of powerful groups who wish to tap into the amazing fund of knowledge to which he is now party.

Carol Drinkwater
as Mary Gore

James Hazeldine
as David Gore

Andrew Ellams
as Matthew Gore

Zoë Hart
as Polly Gore

Devin Stanfield
as Colin

Glynis Brooks
as Chocky

James Greene
as Mr. Trimble

Penny Brownjohn
as Phyl

Colin McCormack
as Alan

Kelita Groom
as Jane