#4 Undertaker shows up to help distract Brock Lesnar
I will admit this one is pure fantasy. I don't expect Brock to work with 'Taker one more time. But stranger things have actually happened, so why not. Undertaker's gong could toll, causing a massive distraction. This, in turn, allows Team SmackDown to claim victory, and could lead to a 'Taker/Lesnar match, if one is even in the cards.
In all honesty, I can't even wrap my head around another match between Undertaker and Lesnar. As much I fondly remember The Phenom, he's not the same Superstar he once was. He does still put on a show, and fans would no doubt pay money just for the chills his entrance provides. But he has no business going in against Lesnar anymore. If you think 'Taker can still go, I do urge you to watch the tag match from Crown Jewel as proof that it's time he hangs up the boots for real.
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That being said, we could still have an appearance of The Undertaker at Survivor Series in some capacity. Would he show up to cause a distraction during the Lesnar match? Maybe, but it would make much sense other than just to mess with The Beast. More likely, we could get The Dead Man just doing his entrance to spook someone into losing.
I'd love to see Undertaker there because, for me, Survivor Series is his birthplace; it's where he made his debut so many years ago. But with his career on the decline, such a surprise appearance doesn't do much for him and certainly does not do anything for WWE. As big a name as Undertaker is, WWE wants to hype his appearances, not have him surprise people at a PPV. Even with last year's WrestleMania "surprise" appearance, he had been talked about for weeks and people expected him. With no mention of him during the lead up to Survivor Series, this is purely wishful thinking. There is a glimmer of hope, if only because he has been around lately, working the two big international shows.