#5 The Rock
The Rock, along with the likes of Stone Cold Steve Austin, Kurt Angle and Triple H, made WWE one of the most watched shows on television. He helped shape the Attitude Era, and after having achieved there is to achieve in the business, quit WWE in 2004, much like Goldberg and Brock Lesnar.
The Rock, though, ventured into films, having already had one mega-hit with The Scorpion King movie. After leaving WWE in 2004, and a flurry of brief appearances, he returned to WWE in 2011, feuding with the likes of John Cena and CM Punk.
He returned once again at WrestleMania 32 where he squashed Erick Rowan in no time, but hasn't featured in WWE since. He has several movie projects on hand, as a producer and actor, and may not be appearing anytime soon on WWE television.