Xtro 3: Watch the Skies is a 1995 British film directed by Harry Bromley Davenport. It is the third film in the Xtro series.
For years, the government has successfully covered up very real proof of U.F.O.s. but when a group of Marines is dispatched to a deserted island, they uncover unsettling evidence: old films documenting brutal medical experiments on aliens. They also uncover a lone surviving alien out for revenge, and a military intelligence plot to sacrifice them and conceal existence of the encounter. The shroud of mystery is about to be lifted.