Anaconda / Anacondas: The Hunt for the Blood Orchid / Anaco...

Anaconda:
A film crew headed by anthropologist Steve Cale and director Terri Flores journey through a river to find a mysterious Indian tribe and shoot a documentary on them. When they save a guy called Paul Sarone from a sinking boat, he offers to help in their search for the tribe. The mysterious Sarone is actually a snake hunter looking for legendary anaconda snake, and when Cale is bitten by some tropical insect, Sarone takes over the boat.

Anacondas Hunt For The Blood Orchid:
The hunters will become the hunted.

A scientific expedition sets out for the island of Borneo in search of a flower named the Blood Orchid. Reports say that this flower can lead to a longer life. But what they find inhabiting the rainforest of Borneo are a group of anacondas. But they aren't ordinary the Blood Orchid made the anacondas longer, faster, and smarter. Now the scientists must find a way out of the rainforest by outsmarting, outrunning and outliving the anacondas

Anaconda Offspring:
Coil up on the couch and prepare yourself for more action, more danger and more snakes! The giant anacondas are back in the next chapter in the thrilling series, starring David Hasselhoff as Hammett, the ruthless mercenary and snake slayer. In a secret government compound, two mega snakes are undergoing testing by a brilliant scientist, Amanda (Crystal Allen). But when the financier, Murdoch (John Rhys-Davies), pushes the experiments too far, the snakes escape, hungry and heading for civilisation. What Hammett doesn't know is that one of the snakes is expecting a litter of slithering offspring. Now the race is on to head off the snakes unstoppable onslaught before they reach the city