5. The Undertaker
Last year The Undertaker made a triumphant return to the WWE by appearing on Old School Raw signaling his intentions to find a challenger for his streak at Wrestlemania. This year it might be too soon for him to find a challenger for his 21 - 0 streak at Wrestlemania but he has unfinished business with a few superstars in the WWE Universe, most notably, The Shield. 'The Deadman' was last seen on an episode of Smackdown defeating Dean Ambrose, but it was what happened after the match that was the most intriguing. The other members of The Shield, Seth Rollins and Roman Reigns attacked The Undertaker after the match and then the three of them tripled powerbombed him through the announce table. The Undertaker has unfinished business with the most destructive trio in WWE history and he needs to get revenge before the trio's impending implosion. What better way for The Deadman to get his revenge and dish out his own brand of justice to The Shield? The spectacle and grandeur The Undertaker brings to the WWE is something Old School Raw really needs, he was a surprise last year and it would be amazing if he showed up again this year. Could he do anything else? Maybe, he could of course issue his Wrestlemania challenge early or even, signal his intentions to enter the Royal Rumble and become the number one contender for the WWE World Heavyweight Championship. 'The Phenom' is a special attraction and Old School Raw could really do with a special attraction.