Let's Kill Uncle
LOVABLE OR LETHAL? Are they bad seeds...or frightened innocents caught in a diabolical duel with death!
Overview
A 12-year-old orphan who has just inherited a fortune is trapped on an island with his uncle, a former British intelligence commander who intends to kill him. A young girl is the boy's only ally against the sarcastic uncle, who uses hypnotism, a pool of sharks, fire, and poisonous mushrooms as weapons.
Trailer
Cast

Nigel Green
Major Kevin Harrison

Mary Badham
Chrissie
Pat Cardi
Barnaby Harrison
Robert Pickering
Travis

Linda Lawson
Justine
Ref Sanchez
Ketchman

Nestor Paiva
Steward

William Castle
Russell Harrison (in car wreck) (uncredited)