Mega Piranha (also known as Megapiranha) is a 2010 science fiction disaster film produced by The Asylum. It was directed by and stars , and . In the tradition of The Asylum's catalog, this film is a mockbuster of Piranha 3-D.

It is the time of the Spanish Inquisition. Maria does not like what is going on during the "Auto De Fe". When she speaks out, she is arrested and accused of being a witch. Torquemada has plans for her! He orders her tortured, and her tongue to be cut out. Her husband attempts to free her...

In the 1400's, Rumpelstiltskin is imprisoned inside a small jade figurine. In modern-day Los Angeles, the recently widowed wife of a police officer, with baby in tow, finds her way into a witch's shop and purchases a certain figurine, resulting in the cackling beast being freed and demanding possession of the baby.

It was a normal night in Las Vegas, Nevada, all the lights were flashing brightly, until a man with one hand, one eye, and one leg walks into a pawn shop with a statue of a hideous looking Leprechaun. The owner claims it's a good luck charm. The statue also wore a medallion around it's neck. The careless pawn shop owner took off the medallion setting the Leprechaun free, along with his pot of gold that everyone wants and like before, he'll kill anyone who goes near it. Driving into town that night was a young man named Scott who was off to L.A. to go to school. Along the way he meets a sarcastic, but friendly, girl named Tammy. Scott tries gambling but loses everything, so he goes to the pawn shop to pawn his Rolex watch. At the shop, he finds the dead owner and one of Leprechaun's gold coins that grants a wish to its finder. Scott wishes for a winning streak, but what he does not know is that the casino is run by a crooked man who hates to lose...

Dr. Lorenz, a mad scientist, wants to keep his elderly wife young. He does this by kidnapping young females and extracting fluid from them. He then injects this fluid into his wife. What a diabolical guy!

The boys are sent to a mountain camp. Stranded in a small rural town, they hear about a "monster killer" roaming the countryside. At night, they sneak out. Peewee is shot by a grave-digger, and they are forced to seek aid at an old mansion. The owner of the mansion (Lugosi), insists that the boys spend the night. After seeing PeeWee walk around the house in a trance, the boys decide that the man turned him into a zombie. They gang up on him and tie him up. The nurse at the boys camp (Dorothy Short) sets out to find the missing boys with Von Grosch (Dennis Moore), who has come to rid the town of the killer- or has he?

A young man finds out that his parents had been used in an atomic-weapons experiment shortly before he was born, and that the results have had some unexpected effects on him.

Mismatched travellers are stranded overnight at a lonely rural railway station. They soon learn of local superstition about a phantom train which is said to travel these parts at dead of night, carrying ghosts from a long-ago train wreck in the area. The travelers eventually get to the bottom of the things that go bump in the night. In between the scary bits, comedian Arthur Askey plays the gags with his Vaudeville style humor, to the constant irritation of his fellow passengers.

A series of strange deaths takes place in London. All are accidents but the victims are single men with no family and they all have a link to a life insurance company run by the mysterious Dr. Orloff.