Rumor has it that two of the largest sharks in existence have been recently roaming New Zealand waters, but nobody knows which one is the largest. Brandon McMillan and Dickie Chivell are heading out to see which one takes the cake -- Phred or Slash?

Josh Gates links up with his childhood hero, William Shatner, to boldly go where Shark Week has never gone before. The mission: enter shark-infested waters to understand the nature of fear and come face to face with an apex predator. This is Shark Trek.

It's a great mystery where tiger sharks give birth. One team of scientists deploys an arsenal of new technology to find out, but they need to meet some of Bahamas' biggest tiger shark mothers face-to-face for it to work.