Something shocking is happening in the abyss around Guadalupe Island. Photos of great whites with strange scars believed to be from giant squids have surfaced. Dr. Tristan Guttridge leads a mission to get a glimpse into the battles between the two beasts.

Animal Planet's International wildlife conservationist and biologist Forrest Galante travels to the mysterious island of Papua New Guinea to definitively prove that sharks are evolving to walk on land.