How many Superstars did it take to separate The Undertaker and Brock Lesnar?

Brock Lesnar confronts The Undertaker: Raw, July 20, 2015
Bret Hart vs. "Stone Cold" Steve Austin - Submission Match: WrestleMania 13
Brock Lesnar brutally attacks Dean Ambrose before Raw
Tommy Dreamer & The Pitbulls battle Brian Lee & The Bruise Brothers all around the ECW Arena: Hardcore TV, April 16, 1996
Finn Bálor & Samoa Joe engage in a wild brawl at NXT Live Event in Portland, Ore.:  May 15, 2016

WWE Network previews, highlights and excerpts

Goldberg’s painful method for getting ring-ready: Goldberg at 54 sneak peek
Big E sets bench press record at John Cena’s gym: WWE 24 sneak peek
Sasha Banks reflects on her five-month WWE absence: Steve Austin’s Broken Skull Sessions sneak peek
Edge & Christian prepare for their Royal Rumble returns: WWE The Day Of sneak peek
The APA reflect on their special bond and friendship: WWE Untold sneak peek