#4 The Great Khali
The Great Khali made his debut for WWE on the April 7, 2006 episode of Smackdown, attacking The Undertaker to set up his first feud in the promotion.
Khali shockingly pinned Undertaker clean at Judgment Day 2006 but lost to the "Deadman" in their re-match which was booked to occur at Summerslam 2006, but was moved to the taped Smackdown show, in the days prior to the event after WWE officials did not trust Khali to wrestle competently on live television.
A former WWE writer just went after JBL for his comments HERE
Therefore, it was a colossal shock then, that less than 12 months later at the July 20, 2017 Smackdown taping, Khali won a Battle Royal to win the vacant World Heavyweight Championship.
Even more astonishingly, Khali managed to hold on to the strap for two months before dropping the belt to Batista at Unforgiven in September.
Khali's reign was a such a great success, that he was never considered for a title run again and became a comedy character before 2007 was over; a position he would retain until he left the company in 2012.
This title reign has been removed from most people's memory.