 Ionizing radiations are used in radiation therapy.In science fiction, mutagens are often represented as substances that are capable of completely changing the form of the recipient or granting them superpowers.Powerful radiations are the agents of mutation for the superheroes in Marvel Comics's Fantastic Four, Daredevil, and Hulk, while in the Teenage Mutant Ninja Turtles franchise the mutagen is chemical agent also called "ooze", and for Inhumans the mutagen is the Terrigen Mist.