If you watched last night's (Mar. 17, 2014) episode of Monday Night Raw, emanating from the AT&T Center in San Antonio, Texas, you undoubtedly noticed that while he was mentioned multiple times throughout the show, Undertaker never made an appearance.
But he was in the building.
He actually did get involved in the night's proceedings but only after the show went off the air. As detailed by Cagesider Jharm, who was in attendance:
The coolest segment wasn't even aired. Cena came out and was confronted by the Wyatts. He told them that the Undertaker would be offended by them stealing his "appearing in a dark ring" gimmick. Everyone got more excited each time he mentioned him, then got disappointed when Cena made it sound like he was building up to the Network appearance. Suddenly the gong hits, arena goes dark, and when the lights go up Taker is standing next to Cena. He got into that ring insanely fast. The two of them proceeded to wreck Harper and Rowan as Bray retreated. Undertaker hit a chokeslam while Cena simultaneously hit the AA. Crowd (including myself) went absolutely crazy. My ears still hurt.
One thing WWE is usually great about is treating its live audience to little nuggets like this. Yes, it makes very little sense that Undertaker would make it out to the arena and then not be used on the actual show, but at least the fans in attendance got to have some exclusive fun with him.