5. Mr Kennedy
Ken Kennedy debuted for WWE in 2005, feuding first with ring announcer Tony Chimel, of all people. He would go on to have numerous feuds on the Smackdown brand, including against the Undertaker, and would hold the United States Title before jumping ship to Raw. He would challenge for numerous titles and feud with Edge, Jeff Hardy and Umaga among others. He was primed for a push in late 2007 as part of a storyline where he would have been Mr McMahon's illegitimate son. However, around the same time a steroid scandal broke out, with Kennedy named as one of eleven wrestlers on the WWE roster accused of buying testosterone and other drugs from an online pharmacy. He was suspended for violating the Wellness policy, and the storyline was swiftly rewritten to cast Hornswoggle as Vince's son. Overall, his potential in WWE was crippled with unfortunate injuries, and the steroid scandal ensured he never received a main event push. He would be released in 2009, before finding success in TNA.