During a Space Shuttle mission a satellite rams a unidentified flying object. The UFO afterwards performs an emergency landing in the deserts of Arizona. However the White House denies it's existence because of the near presidential elections. The UFO is brought to the secret hangar 18 and the accident is claimed to incompetence of the astronauts Bancroff and Price. But the two fight against this and try to hunt down the UFO.
A married man's one night stand comes back to haunt him when that lover begins to stalk him and his family.
Sean Kane is forced to resign from the San Francisco Police Department's Narcotics Division when he goes berserk after his partner is murdered. He decides to fight alone and follows a trail of drug traffickers into unexpected high places.
A large spider from the jungles of South America is accidentally transported in a crate with a dead body to America where it mates with a local spider. Soon after, the residents of a small California town disappear as the result of spider bites from the deadly spider offspring. It's up to a couple of doctors with the help of an insect exterminator to annihilate these eight legged freaks.
Una specie di ragni molto velenosi, importata erroneamente dal Venezuela, prolificherà molto rapidamente e si insinuerà in una tranquilla casa di provincia. Gli inquilini, insieme a tutta la cittadina, sono ignari di ciò che li aspetta...