New Boss for Avengers UBF (Patreon)

Kyle Lykos is a skilled psychiatrist. As a young boy, He went with his father on an expedition to Tierra del Fuego. At one point during the trip he was attacked by gigantic pteranodons (In actuality, these pteranodons were from the Savage Land). The pteranodon bites somehow changed Karl, apparently altering his genetic structure. Karl discovered that he needed to drain life energy from other living beings to survive.