Terrigenesis is a process in the Marvel Comics universe where certain individuals, known as Inhumans, undergo a transformation after exposure to a substance called Terrigen Mist. This mist activates dormant genes within them, granting unique superhuman abilities. The process is often triggered during a rite of passage for Inhumans, marking their transition into full members of their society. The Inhumans were created by Stan Lee and Jack Kirby and first appeared in Fantastic Four #45 in 1965. The Terrigenesis process can vary in its effects, leading to a wide range of powers, from enhanced strength to elemental control, depending on the individual's genetic makeup.