The Undertaker made his return to WWE on Sunday night, interfering in the WWE World Heavyweight Championship match between Seth Rollins and Brock Lesnar at the Battleground pay-per-view. The Deadman delivered a chokeslam and two Tombstone Piledrivers to Lesnar, potentially setting up a match between the two wrestlers at SummerSlam 2015.

It had been nearly four months since The Undertaker made an appearance on WWE TV, defeating Bray Wyatt at WrestleMania 31. His previous appearance was at WrestleMania 30 when Lesnar broke The Streak, and it looks like the Deadman is finally looking for retribution.

Many fans watching Battleground might have been surprised to see The Undertaker, but his return wasn't exactly unexpected. Multiple dirt sheets reported last week that The Undertaker would have a match at SummerSlam, with the build for the match set to begin on Sunday or Monday.

If The Undertaker does end up having a match at SummerSlam, it would be an extremely rare occurrence. While he did wrestle on "Monday Night Raw" "SmackDown" and at a live event in 2013, The Undertaker hasn't had a match at a non-WrestleMania PPV since he faced Kane at WWE Bragging Rights in October 2010.

The finish to Battleground leaves a lot of unanswered questions for SummerSlam, which is scheduled for Aug. 23 in Brooklyn. Lesnar didn't beat Rollins in their rematch for the WWE World Heavyweight Championship, but the referee was nowhere to be found when The Undertaker interfered and the match never officially ended.

While The Undertaker came back on Sunday, he might not be the only wrestling legend that will return to have a role at SummerSlam. There have been widespread rumors that Sting will also be at the PPV.

It had been speculated that The Undertaker vs. Sting would be on the SummerSlam card, but now it appears likely that the Deadman will face Lesnar. The Undertaker could have a match with Sting at WrestleMania 32.