#8: MIL MUERTES
With the Undertaker set to retire soon, the WWE may look elsewhere to cultivate another formidable supernatural threat.
They've tried and failed with Bray Wyatt. It was off to a good start, but after Wyatt lost practically every feud he was in, he lost all of his credibility.
He's currently off TV, perhaps for a repackaging. His return might come before or during the Royal Rumble.
Enter the Man of 1,000 Deaths, Mil Muertes.
Muertes has also wrestled in AAA as Ricky Banderas and he's been one of the bigger stars in Mexico for the last decade.
His supernatural character has been one of the foundational characters on which the legend of Lucha Underground was built.
He's strong, sudden and has a power-based move set including a spear, a flat-liner and a bevvy of strikes.
He speaks English well which is extremely important for a non-English speaking professional wrestler in WWE.
It's why Shinsuke Nakamura and Andrade Almas have had shots in WWE. Although their English is anything from perfect, they are either passable enough or were given a mouthpiece (Zelina Vega).
Lucha Underground isn't necessarily assured a fifth season, although it should get one.
A lot of the big names might be leaving, like a few later on this list, so it might be a little harder to man a credible roster.
Although he's over 40, Muertes looks incredible and is still great in the ring. Watch any of his Grave Consequences matches or title matches with Pentagon Jr., King Cuerno, Prince Puma, etc.
AJ Styles, John Cena, R Truth and Bobby Fish are all over 40 and all (except Cena) are heavily featured on their respective brands.
He'd probably come without Catrina, though. Or maybe they could pair him with Rosemary if she's also signed.