"I'm John Cena." But as we'd see decades later, the problem with turning John Cena heel is that he's John Cena. This led to a routine chant that echoes through arenas today: Cena fans chanting "Let's Go Cena!" Cena then declared that was the night when "John Cena came back to the WWE." Now, in the final matches of his final era, John Cena will retire with the only persona that really matters: As John Cena.