Sven Olafson

 is a fictional explorer and an antagonist featured in the Hellboy comic book franchise. He first appeared in Hellboy: Seed of Destruction #1 in March, 1994.

Biography
Sven Olafson was a renowned Norwegian Arctic explorer. He led an expedition with three of the Cavendish brothers, as well as the aging Professor Trevor Bruttenholm. They were nineteen days out of Bull Harbor, fifteen of which was spent on an icebreaker ship and the remainder on a snow tractor. By the time they got to the Heisenvald Ridge, they had to go the rest of the way on foot. They eventually discovered the ruins of a temple at Yang Kor. Then he became a frog monster. It happens.