Early 90s/2000s movie where a zoologist turns into a snake

The story of the romance between the King of Siam (now Thailand) and the widowed British school teacher Anna Leonowens during the 1860s. Anna teaches the children and becomes romanced by the King. She convinces him that a man can be loved by just one woman.

In 1862, a young Englishwoman becomes royal tutor in Siam and befriends the King.

A zoologist is called to a construction site that has been plagued by snakes. He finds out that the place once was the ancient headquarters of a snake-worshiping cult and that the same cult placed a curse on the grounds. Soon the zoologist and the workers find themselves under attack by hundreds of deadly snakes.

The story of a woman cursed to occasionally transform into a killer snake. Followed by a 1990 sequel.

An Aztec princess changes into a snake and kills a doctor.

After an overly ambitious businessman transports an 80-foot python to the United States, the beast escapes and starts to leave behind a trail of human victims. An FBI agent and a snake specialist come up with a plot to combat the creature by pitting it against a bioengineered, 70-foot boa constrictor. It's two great snakes that snake great together!

An object is found that points to the secret of eternal youth so a research team is sent to find the fountain only to find it is protected by a giant snake

1991 Bollywood snake movie

A group of venomous snake experts journey into the jungle and uncover a deadly serpentine curse.