Alien movie with a giant rolling ball through tunnels underground

In a galaxy far away, alien criminals organize a spectacular prison break. Pursued by their home planet's authorities, their leader Zin decides there's only one place to go: through a wormhole that allows instantaneous travel to Earth. Cole is the Alien Tracker who's in hot pursuit of the escaped convicts.

The movie begins with an extraterrestrial humanoid species, the Glegoliths, wandering through space in search of a new world. Encountering an unknown planet (which turns out to be Earth), the Glegolith leader (Cyrillus) sends two "manned" probes to the surface to determine if it is suitable for colonisation. The scouts in the probes think they have arrived at a great city, but in fact they have arrived at a new amusement park that is not yet open to the public. They proceed to explore four amusement rides.

A group of cave explorers are confronted in an underground cavern by a mysterious living rock. Little do they know that it bears home to deadly, flesh-eating creatures, intent on wiping out the entire human population. An ultra low-budget, unofficial and unauthorized sequel to the 1979 film Alien, although the plot has little connection to the original film.

In 1957 a fiery object crashes into a mountaintop in the California desert, bringing the threat of disaster to Earth. Out of the flying saucer escapes a murderous creature, the Ghota, bent on destroying all life forms on the planet. A benevolent alien from the spaceship, Urp, inhabits the body of Ted Lewis, an astronomer and with the help of Tammy, a diner waitress, sets out to save mankind.

When her archaeologist father disappears on an expedition, Wanda sets out to look for him. What she finds is a secret underground world, where no one believes in life on the surface and where she and her father are taken for spies.

Two members of Greenpeace discover that a local factory sheds radioactive waste into an active volcano, which has created a terrifying creature that wreaks havoc in the area.

Alien creatures invade human bodies and turn them into cybernetic fighting machines.