 On the heels of his feud with Edge, Cena was placed in an inter-brand angle to determine the "Champion of Champions" – or which was the most dominant champion in WWE's three brands. Cena, the World Heavyweight Champion King Booker, and the ECW World Champion Big Show engaged in a mini-feud leading to a triple threat match at Cyber Sunday, with the viewers voting on which of the three championships would be placed on the line. At the same time, Cena became involved in a storyline with non-wrestler Kevin Federline, when he began appearing on Raw with Johnny Nitro and Melina. After getting into a worked physical altercation with Federline on Raw, Federline appeared at Cyber Sunday to hit Cena with the World Heavyweight Championship during the match, helping King Booker retain his championship. 2006 ended with Cena beginning a feud with the undefeated Umaga over the WWE Championship, while 2007 began with the end of his storyline with Kevin Federline. On the first Raw of the new year, Cena was pinned by Federline with an assist from Umaga, although later in the night he was able to get his hands on Federline performing an FU on him.
