Kelsey Banks

The special takes viewers deep into prehistoric waters to explore the ancient ancestors of today's sharks. Using animation, the episode highlights some of the most feared prehistoric ocean creatures, including the Dunkleosteus, the buzzsaw shark (Helicoprion), and the scissor-toothed shark (Edestus).

The Discovery Channel's Shark Week, first broadcast on July 17, 1987, is a weeklong series of feature television programs dedicated to sharks. Held annually, normally in July or August, Shark Week was originally developed to raise awareness and respect for sharks. It is the longest-running cable television programming event in history. Now broadcast in over 72 countries, Shark Week is promoted heavily via social networks like Facebook and Twitter.