#4 Eugene: 2009

Easily one of the most controversial characters in WWE history, Eugene still became one of the most popular superstars in WWE in 2004. After his main storylines with Triple H and his 'Uncle', Eric Bischoff came to an end, Eugene shifted around the mid-card before being released from his contract in 2007.
Much like when I mentioned Chris Masters earlier, like him, Eugene was also brought back to WWE as the company doing a favor for Eugene's friend, then WWE Champion Randy Orton. Eugene returned to WWE TV on the August 10 episode of RAW, losing a 'Contract on a Pole' match to The Calgary Kid, who afterward removed his mask to reveal himself as the recently 'fired', The Miz. Eugene was released from his contract later that week.
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He briefly returned to WWE as a trainer in September 2013 but was released in October 2014.