#1 Brock Lesnar returns
Well, it is expected that the Monster among Men, Braun Strowman will clash with The Beast Incarnate, Brock Lesnar for the Universal Championship at Royal Rumble.
To no one's surprise, Lesnar being a part-timer, will not feature at TLC. However, in order to build up for his feud against Strowman, expect The Beast to feature on Raw following TLC and stamp his authority back on the red brand.
WWE could have him feature in the opening segment with Paul Heyman to deliver a fiery promo against Braun Strowman which would then set the tone for their feud.
Royal Rumble might be the last appearance of Lesnar as per his current contract as he is expected to make his UFC return after Rumble for his match against Daniel Cormier. However, it would be interesting to see how WWE deals with the situation, given WrestleMania 35 is not far away.