Brock Lesnar's surprise attack on John Cena at SummerSlam 2025 has set up the start of a new feud between the two WWE legends.
Multiple wrestling news sources confirm that Lesnar's appearance and F-5 on Cena immediately after the main event was designed to ignite a fresh rivalry. This confrontation came at a pivotal time in Cena's career, with his retirement tour underway, making the prospect of a Lesnar vs. Cena program even more significant.

The abruptness of Lesnar's return and his immediate targeting of Cena signal a deliberate storyline direction by WWE. Typically, high-profile returns like this-especially when centered on another marquee name like Cena-indicate the start of a major rivalry.
Cena's career is at a crossroads, with many speculating this may be his final full-time run before retirement. Lesnar inserting himself now raises the stakes and emotional intensity, likely positioning their showdown as a farewell chapter or a marquee match for a major future event.
Fans and wrestling media have overwhelmingly interpreted this moment as the beginning of an extended feud. Many outlets note that Lesnar and Cena have a storied history in WWE, but this recent twist adds a fresh chapter, fueled by both men's legendary statuses and the current uncertainty about Cena's long-term future.
While WWE has yet to confirm the first match or specific dates, all indications are that Lesnar and Cena are on a collision course, setting up what is expected to be one of the most anticipated storylines of the year. It is a likely thing that these two wrestling legends may reignite their feud in the twilight of their careers.