John Cena is set to retire from WWE at Saturday Night's Main Event this weekend. The 17-time world champion will face Gunther in his final match on December 13.The TV special will also feature several matches pitting main roster stars against those from NXT. However, there could also be a massive twist in the form of an appearance from The Rock.The Final Boss helped facilitate John Cena's heel turn at Elimination Chamber 2025, but was absent from television for the remainder of the year. Following his Golden Globe nomination for his role in The Smashing Machine, The Rock could make a return to WWE for one night only.In such a scenario, here are three things he could do.3. Give John Cena a send-offCena has made it very clear that his match against Gunther will be his last-ever. Therefore, the notion of another bout with The Great One seems out of question.Since there is still a bit of unfinished business between the two, The Rock could return to WWE after Cena's match and could give the 17-time world champion a grand send-off with a heartfelt speech. Cena retiring from in-ring competition, acknowledged by one of his biggest rivals and a member of TKO's board of directors, would surely be a great way to end the show.2. Endorse Drew McIntyre as his championThe real-life friendship between Drew McIntyre and The Rock is well-documented. However, they have not interacted much, if at all, on screen. That could change if the former WWE Champion returns to endorse Drew McIntyre as his champion.Earlier this year, he made the same offer to Cody Rhodes, which the latter turned down at Elimination Chamber. While the Hollywood star has been absent from programming ever since, he could pick up where he left off by endorsing Drew McIntyre as his champion, setting him up in a perfect way to dethrone Rhodes.1. The Rock could attack Cody Rhodes after his matchCody Rhodes is set to face NXT Champion Oba Femi in an exhibition match at Saturday Night's Main Event this weekend. The Ruler has the size advantage in the match, but Rhodes has one of the best records in big matches in the company.Regardless of the outcome, a return from The Rock would completely change the talking points after the match. If The Final Boss does indeed make a comeback, he could pick up where he left off and renew his rivalry with The American Nightmare. To set up their feud, he could take out Rhodes with a Rock Bottom and tell him that things aren't over between them.This way, Rhodes would have a huge match with The Rock in the works, potentially at WrestleMania 42. There is a lot to unpack between the two stars, and WWE could finally deliver the match that was teased last year.However, these scenarios remain speculative for the time being, and there is no confirmation on whether or not The Brahma Bull will appear at Saturday Night's Main Event.