Kragoff knew enough of the Fantastic Four's history, and he purposefully designed his rocket in such a way that he and his crew would be heavily exposed to the cosmic rays that he expected would infuse them with superpowers. This was successful: Kragoff gained the ability to become as intangible and invisible as a "ghost", Mikhlo became super humanly strong and durable, Igor gained the ability to shapeshift and could transform into nearly anything, and Peotr gained the ability to attract and repulse objects.