Silverhide

In the desolate Welsh mountains, a group of conspiracy theorists secretly observe a Top Secret military base, seeking to uncover classified information on experimental aircraft for their magazine. However, they stumble upon a highly lethal creature, discovered in the 1920s, whose fur can turn invisible in moonlight. As they try to escape, they're hunted by both the creature, dubbed "The Silverhide" by the Army, and the military, who will do anything to keep their secret specimen hidden.