#3 The Shield vs. Brothers of Destruction (WWE SummerSlam 2013)
Right after WrestleMania 29, The Undertaker entered a rare non-'Mania rivalry against The Shield, which was set to culminate at SummerSlam. He was joined by his brother, Kane, and Daniel Bryan. Team Hell No had saved the Deadman from getting a beatdown from the Hounds of Justice, setting the stage for a six-man tag team match.
The two teams went to battle on the April 22nd episode of RAW, emanating from the United Kingdom. The Shield emerged victorious over Undertaker and Team Hell No, but 'Taker did get some retribution on the following episode of SmackDown.
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The WWE legend defeated Dean Ambrose but was promptly decimated by him, Rollins, and Reigns afterward. The Shield gave Undertaker a hellacious triple powerbomb through the announce table, sidelining him for a while. The plan was for the Deadman to return in time for SummerSlam to team with Kane against The Shield, possibly in a handicap match.
However, Undertaker did not recuperate in time and as a result, this stone was left unturned. The Shield would have likely suffered their first clean loss to the Brothers of Destruction at SummerSlam, but ended up being off the card entirely. This was just one of the multiple Undertaker dream matches that never ended up happening.