John Cena's retirement tour could climax at WrestleMania 42 with blockbuster opponents. The Rock looms after sparking Cena's heel turn, Drew McIntyre seeks a singles feud, Roman Reigns may renew dominance, and Brock Lesnar offers revenge from past battles. Each name adds intrigue, ensuring Cena's farewell storyline delivers maximum drama and star power on WWE's grandest stage.