De-evolution

President Koopa wielding a portable Devolution Gun.

De-Evolution is a term used to describe the process of reverting a being to a lower stage in their evolution in the Super Mario Bros. film. De-evolution may affect level of intelligence as well, though not all de-evolution results in a loss of intelligence. The first known victim of this process was King Bowser, Daisy's father and previous ruler of Dinohattan.

De-evolution is usually a form of corporal punishment used by President Koopa in the creation of Goombas for use as a dumb, but strong and loyal police force. These Goombas are created by resetting them to a stage in their racial evolution that is somewhere between that of their saurian-ancestors and their current, humanoid form. This results in a tall and bulky creature with a small, underdeveloped reptilian head of either frog-like, raptor-like, or snake-like appearance, which depends on particular ancestry.

This process was originally achieved through use of a special, room-sized machine, but Koopa later developed the technology into portable-form to use as weapon in his upcoming attack on the dimension that his own had split off from.

Use of de-evolution on Humans results in small, monkey-like creatures that resemble chimpanzees.

The process can also work in the opposite "direction", which results in improved cognitive-thinking and comprehension. However, mental capabilities can only be extended to a certain point. Actual intelligence cannot move higher than a person is neurologically-capable.