Movies like Showdown at Area 51

16-year-old Cassie Sullivan tries to survive in a world devastated by the waves of an alien invasion that has already decimated the population and knocked mankind back to the Stone Age.

For the past 60 years, a space-traveling smart-ass named Paul has been locked up in a top-secret military base, advising world leaders about his kind. But when he worries he’s outlived his usefulness and the dissection table is drawing uncomfortably close, Paul escapes on the first RV that passes by his compound in Area 51. Fortunately, it contains the two earthlings who are most likely to rescue and harbor an alien on the run.

Two hundred years after Lt. Ripley died, a group of scientists clone her, hoping to breed the ultimate weapon. But the new Ripley is full of surprises … as are the new aliens. Ripley must team with a band of smugglers to keep the creatures from reaching Earth.

A chief mechanic at a factory, haunted by apocalyptic nightmares, becomes a hero when Earth is invaded by a mysterious army bent on destruction.

A police chief in the war-torn streets of Los Angeles discovers that an extraterrestrial creature is hunting down residents - and that he is the next target.

Betrayed by his own kind and left for dead on a desolate planet, Riddick fights for survival against alien predators and becomes more powerful and dangerous than ever before. Soon bounty hunters from throughout the galaxy descend on Riddick only to find themselves pawns in his greater scheme for revenge. With his enemies right where he wants them, Riddick unleashes a vicious attack of vengeance before returning to his home planet of Furya to save it from destruction.

The ultimate weapon, claimed to be safe for mankind, produces global side-effects including time slides and disappearances. The scientist behind the project and his car are zapped from the year 2031 to 1817 in Switzerland where he meets Dr. Victor Frankenstein, Mary Shelley and others.

A special-ops team is dispatched to fight supernatural beings that have taken over a European city.

Thomas Jerome Newton is an alien who has come to Earth in search of water to save his home planet. Aided by lawyer Oliver Farnsworth, Thomas uses his knowledge of advanced technology to create profitable inventions. While developing a method to transport water, Thomas meets Mary-Lou, a quiet hotel clerk, and begins to fall in love with her. Just as he is ready to leave Earth, Thomas is intercepted by the U.S. government, and his entire plan is threatened.

Starship C57D travels to planet Altair 4 in search of the crew of spaceship "Bellerophon," a scientific expedition that has been missing for twenty years. They find themselves unwelcome by the expedition's lone survivor and warned of destruction by an invisible force if they don't turn back immediately.

SIRIUS 6B, Year 2078. On a distant mining planet ravaged by a decade of war, scientists have created the perfect weapon: a blade-wielding, self-replicating race of killing devices known as Screamers designed for one purpose only -- to hunt down and destroy all enemy life forms.

Ripley, the sole survivor of the Nostromo's deadly encounter with the monstrous Alien, returns to Earth after drifting through space in hypersleep for 57 years. Although her story is initially met with skepticism, she agrees to accompany a team of Colonial Marines back to LV-426.