Ric Flair approves as John Cena puts hurt on Jon Stewart at WWE Raw

Slated to simply serve as the "host" of WWE SummerSlam on Sunday, celebrity guest Jon Stewart wound up surprising fans by interfering in one of the main events to a shocking outcome. Stewart returned to the squared circle at Monday Night Raw in Brooklyn, presumably to explain his actions.

Stewart on Sunday influenced the Title vs. Title match at the WWE pay-per-view, hitting John Cena with a chair -- thus allowing Seth Rollins to retain his World Heavyweight Championship and win Cena's United States Championship.

On Monday, Stewart tried to explain why.

"It was not in any way to help Seth Rollins retain the heavyweight championship, as well as he fought. It was not to help The Authority, because it was best for business. It was because, in my heart, I could not let John Cena tie the great Ric Flair for 16 championships because, in my mind, 'The Champ is Flair,'" he said. "Not on my watch. Wasn't going to let it happen."

That's when Flair's music hit and The Nature Boy walked to the ring. "You have messed up everything," Flair said.

Then, it was Cena's turn to hit the ring, take the mic and lambaste Stewart for his actions.

Stewart tried to hold his ground, verbally, against the 15-time champion, and it cost him in the end.

Cena, who has not held the WWE World Heavyweight Championship in more than a year, is looking to tie Flair's record of 16 world title reigns.

Jon Stewart interfered in SummerSlam on Sunday. (WWE)