Evolutionaries are a race of humanoid animals with the abilities of four other animals within them as well as their own, not to mention unique powers. Like robots and genetic experiments, the Evolutionary is not born how it is, it is created. Their creation is a process called "Evo-Fusion". The Evolutionary's intelligence is bestowed upon them when their brain is switched with a human's usually resulting in the termination of said human's original body. The new body often has a flaw which activates when whatever a circumstance is met, for example, Clem temporarily loses her ability to swim whenever she hears the phrase "Dreadful Sorry".