

Sandy and Greg are teenagers who go camping, despite warnings not to, with their friends. They soon encounter aliens, who are using the area as a hunting ground.
Practical Effects
Frisbee aliens with faces like angry scrotums — sincerely terrifying.
Acting
Palance and Landau treating schlock like Shakespeare, bless them.

Director
Greydon Clark
Trivia, insights & behind the scenes
This film's alien hunter concept directly inspired Predator; producers later hired the same actor (Kevin Peter Hall) and even reused some Without Warning footage for early Predator promos.
Greydon Clark made this immediately after Angels' Brigade, cementing his status as king of 'how did this get financed' 70s exploitation.