5 Superstars who appeared for rival promotions while still under contract with WWE

#4. Former WWE star CM Punk - Ring of Honor 2006

CM Punk initially came to WWE from Ring of Honor after he became one of the company's most popular stars. With "The Summer of Punk," he had an incredible farewell when he finally left the company.

Though Punk signed with WWE in 2005, Ring Of Honor found themselves in something of a dilemma the following year. There was a snowstorm in Long Island, New York, in February 2006. As a result, several of the roster's top stars were unable to make the show. The promotion put out a message for help from anyone who was available

They needed all the help they could get. Thankfully, Punk was one star who answered the call. The newly-signed WWE star asked permission to appear at the Ring of Honor show. WWE accepted the request, and Punk went on to make a surprise appearance at the event. Punk's return delighted fans, and it was one of the most shocking moments of 2006.

CM Punk in Ring of Honor