Survivors of a plane crash on a remote island find it is covered by spiders. When bitten, the survivors start turning into spiders! - IMDB Description

A plane crash leaves a dance troupe stranded on a deserted island where a mutant spider bite turns the troupe's leader into a monster. This movie was featured on Mystery Science Theater 3000 ep. 1011. You can find out more about this movie on its IMDB page.

The Phantom Creeps is everything an old classic B sci-fi is supposed to be. It features Bela Lugosi (as Dr. Zorka), a mad megalomaniac genius with a utility belt and a sack of gadgets that would make Batman and James Bond blush, against a team of CIA-types, a reporter, and local law enforcement. Lugosi hams up a storm and really seems to enjoy himself in this immensely silly role. His somewhat untrustworthy and dull side-kick, played by Jack Smith is a great foil to his overbearing stage presence, and he makes a truly great sadist!

Late one night on a rural road in the western US, a policeman sets up a roadblock and begins stopping all traffic. When several cars and a big truck have stopped, he and the others learn the reason for this roadblock........

A young man is transformed into a hideous "moon beast" due to a meteor fragment lodged in his body. (from IMDB)

Taken from IMDB: On an isolated island, a small group of people is terrorised by giant, voracious shrews in the midst of a hurricane.

An ex-major breaks a safe-cracker out of jail to use as a guinea pig for an invisibility ray with hopes of eventually building an invisible army. Things go awry though when the safe-cracker develops his own plans. This movie was featured on Mystery Science Theater 3000 ep. 623. You can find out more about this movie on its IMDB page.

From IMDb: Benevolent aliens from the planet Emerald send superhero Starman to protect Earth from invasion by an evil alien race called the Spherions. When Starman arrives on Earth, he discovers a conspiracy involving Earth's top scientists, and he must root out the traitors and also stop the impending alien invasion.

Classic sci-fi from 1961. A rocket crashes on an invisible planet during an investigation. The surviving astronaut encounters a race of miniature people: the women are VERY interested! The low budget belies the fact films like this were thematically the precursor to modern sci-fi.

From IMDb: An alien being lands in Santa Monica. Killing two people who attacked him due to the menacing appearance of his spacesuit, the creature takes it off while being pursued by government authorities, revealing himself to be invisible