Katheryn Winnick (born December 17, 1977) is a Canadian actress. She is known for her starring roles in the television series Vikings, Wu Assassins, Big Sky, and her recurring role on the television series Bones.
Afflicted with a disease that threatened to leave him deaf, Dr. Kirk Langstrom devised an experimental cure that merged the DNA of humans and bats. After testing it on himself, however, the cure backfired and transformed him into a giant bat-like creature.
