This is probably the most fun part of the Royal Rumble: welcoming back superstars of yesterday and other injured wrestlers who return to action. The cool part of the Rumble is not knowing who is coming out from behind the curtain next. Fans count down with the timer and eagerly anticipate the next participants entrance music, then react accordingly. Weve seen superstars like John Cena and Edge return from injury to win the Rumble. And weve seen legends like Hacksaw Jim Duggan (winner of the first Rumble), Mick Foley, Rob Van Dam, Diesel, Booker T and others make one-shot appearances to compete. There are entire lists dedicated to the best surprise returns in Rumble history, and deservedly so.With the WWE World Heavyweight Championship on the line, who could come out and try their hand at winning the title? Maybe the Undertaker returns to exact revenge on Brock Lesnar. Fans love to speculate about injured superstars like Daniel Bryan and Randy Orton. And of course, you have AJ Styles as the most heavily rumored wrestlers to make a surprise appearance. If even a couple of these types of surprises happen, it could make for a very memorable Rumble.