Shanna is the result of a Nazi genetic breeding experiment where she was designed to be a super soldier. Doc, a member of a scientific expedition, was the first to encounter her, and named her Shanna after the comic character.  She joined an encampment of soldiers who had become stuck on Monster Isle and helped them to survive.
When a group of pirates sought refuge on the island after being attacked by a Leviathan she also helped them to survive and escape their pursuers and stay alive long enough to get off the island. Shanna herself decided to stay as she liked it there
Powers and Abilities
Shanna was bred and genetically designed to be the perfect Super-Soldier. She is stated to be roughly as strong as a dozen men, having been shown to be strong enough to break a raptors neck with ease, lift and wield a large log as a weapon, kick open a strong metal door, hold open a tyrannosaurus rex's mouth and decapitate a raptor with a single swing of a machete, slice one in half with ease and throw a human being in excess of a hundred feet. She is also partially invulnerable with skin which is hard to puncture or bruise. Her invulnerability allows her to physically fight dinosaurs, such as raptors, without coming to any harm and was uninjured after being hit with a swing from a tyrannosaurus rex tail and was only slightly harmed when thrown into a tree by a t-rex with enough force to break it in half and collapse it on top of her.
Shanna possess highly honed killer instincts and carries instinctive knowledge on how to fight in such a way as to utilise her strength while conserving energy.
Shanna was able to become fully fluent in English within five weeks. She was also able to quickly study the gait of a t-rex and calculate its mass and momentum to allow her to down it with a spear.
Roughly as strong as a dozen men
Initially she struggled with a lack of empathy and human connection as well as difficulty controlling her killer instincts.