In ‘Transformers: The Last Knight,’ characters are constantly changing shape. When things take on new forms in films it usually means the story is about to change in a big way. Here are just a few of the many things that have epically transformed on the big screen over the years.

The Wolf Man (1941)

As they say: "Even a man who is pure in heart and says his prayers by night may become a wolf when the wolf bane blooms and the autumn moon is bright."

The Nutty Professor (1996)

Professor Klump was never the smoothest guy with the ladies, at least not until he drank the special concoction he created that turned him into Buddy Love.

Sssssss (1973)

In this '70s cult classic, college student Dirk Benedict is transformed into a snake by his evil scientist boss.

Dracula (1931)

Count Dracula transformed into a bat whenever he needed to make a fast getaway.

The Fly (1986)

A scientist transforms into a giant fly after one of his experiments goes terribly wrong.

Attack of the 50 Foot Woman (1958)

An abused socialite grows to giant proportions after an alien encounter.

Snow White and the Seven Dwarfs (1937)

The evil Queen transforms into an old hag in order to give Snow White a poisoned apple.

The Mask (1994)

Bank clerk Stanley Ipkiss is transformed into a manic wild man whenever he wears a mysterious mask.

The Incredible Hulk (2008)

Due to a gamma ray experiment gone wrong, Dr. Bruce Banner transforms into a green-skinned giant whenever his pulse rate gets too high.

Gremlins (1984)

If you don't want these adorable pets to transform into green monsters, be sure to obey three simple rules:  No water, no food after midnight and no bright light.

Cinderella (1950)

Cinderella is able to attend the ball in style after her fairy godmother transforms a pumpkin into a beautiful carriage.

Superman (1978)

At the first sign of trouble, mild-mannered Clark Kent transforms into Superman!

Ghostbusters (1984)

The Ghostbusters accidentally transform evil spirit Gozer into the Stay-Puft Marshmallow Man right before the big battle.

Ultraman (1972)

With the use of the "Beta Capsule," Shin Hayata transforms into that super-humanoid-powered giant from space -- Ultraman.

Abbott and Costello meet Dr. Jekyll and Mr. Hyde (1953)

When scientists experiment on themselves in movies, things rarely go right. Just check out what happened after kind Dr. Jekyll drank one of his own potions.