4- The return of Kane
Kane doing an unannounced appearance at WrestleMania would still be a big deal.
Kane is one of the most accomplished Superstars in WWE history, but his appearances on WWE shows have been few, and far among over the past couple years because of his works as the mayor of Knox County in Tennessee.
The Undertaker will face AJ Styles at WrestleMania, The Deadman will be at a disadvantage, with OC members Luke Gallows and Karl Anderson supporting up Styles. In that situation, perhaps someone could arrive to help even the odds a bit.
Kane would be the perfect candidate since he is The Undertaker’s storyline brother, and is more compatible with The Phenom than anyone in WWE history.
Having Kane show up to fight off The OC, and take part in a Brothers of Destruction reunion would be a fun piece of business for longtime fans, and create another great WrestleMania moment for two of the all-time greats.