At the end of the 2015 comedy hit Daddy's Home, John Cena made a cameo appearance as a buff, rough-looking rival for Mark Wahlberg's kids' affection and that's where the movie essentially ended.
In the planned sequel, Cena would be reprising his role but he would have a bigger part. This is the official synopsis according to Deadline:
“Father and stepfather, Dusty (Wahlberg) and Brad (Ferrell), who are now working together to give their kids a perfect Christmas. When Dusty’s Dad (Gibson) and Brad’s Dad (Lithgow) arrive, their blended family conflicts rise to the surface. Cena’s character shifts the macho dynamics as Dusty faces the challenges of being a stepfather in the face of a more ripped rival.”