Llegan sin avisar was released in the year 1980。Llegan sin avisar is also called as Without Warning, Terreur extraterrestre, It Came Without Warning, Ilman varoitusta, Horror caccia ai terrestri, Geheimnis der fliegenden Teufel, Alien Warning, Alien Shock, Alien Encounters。

Llegan sin avisar actors and actresses include Darby Hinton, Jack Palance, Kevin Peter Hall, Larry Storch, Martin Landau。