Lapsed fan's guide to WWE SummerSlam: The return of John Cena

Haven't been paying attention to WWE lately? Let's get you caught up before WWE SummerSlam on Saturday in Las Vegas.

source https://www.espn.com/wwe/story/_/id/32044820/wwe-summerslam-lapsed-fan-guide-summerslam-return-john-cena