WWE SummerSlam 2015: Jon Stewart helps Seth Rollins defeat John Cena

Jon Stewart was more than just the host of WWE SummerSlam on Sunday night.

He also helped Seth Rollins, once Stewart's on-screen rival, defeat John Cena and become the first man to hold both the WWE World Heavyweight and United States championships at the same time.

As Rollins and Cena were involved in an entertaining title match at the Barclays Center in Brooklyn, N.Y., Stewart ran to the ring with a steel chair in hand while the official was out of commission. Stewart then hit Cena in the gut with the chair and threw it on the mat, setting up Rollins to deliver a pedigree to Cena, and his surgically repaired nose, on the chair.