Undertaker — Appearing on ‘Tonight Show’ to Promote Survivor Series Anniversary (UPDATE W/ VIDEO)

Undertaker fallon tonight show

WWE legend The Undertaker will be appearing in a sketch Wednesday on the Tonight Show with Jimmy Fallon … and he’s already in the building — Pro Wrestling Sheet has learned.

The Lord of Darkness is currently backstage at the 30 Rockefeller Center and will be making an appearance during tonight’s show when it starts filming … sources confirm.

No word on what Undertaker and Fallon will be doing on the show, but we’re told the 50 year-old wrestler is there to promote his 25th anniversary of debuting at Survivor Series.

Our sources say Fallon and his social media channels will soon begin to promote the appearance.

UPDATE: Here’s the clip.