#2 WWE collaborated with Mexico's AAA in 1997
When WWE opened up shop with ECW in the mid-90's, they also took a leap of faith with Mexican promotion Triple A. WWE's rivals, WCW, had introduced a brand-new cruiserweight division that was capturing a lot of excitement from fans. Vince McMahon wanted to rival this.
The initial idea saw plans to have the 1997 Royal Rumble become a collaboration event between WWE and AAA. Instead, AAA had a number of dark matches before the pay-per-view began, a match during the show, and their wrestlers appeared in the Royal Rumble match itself.
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Following the event, the relationship between the two promotions was quietly dropped.
#1 WWE collaborated with NJPW and AJPW for The Wrestling Summit
Voted as the Best Major Wrestling Show in 1990 by the Wrestling Observer, The Wrestling Summit came to the Tokyo Dome. It was a major collaboration between WWE, New Japan Pro-Wrestling and All Japan Pro Wrestling. Vince McMahon's company already had a relationship with NJPW that stemmed from the 70's.
The first-event of its kind saw over 50,000 people attend. The main-event saw WWE's Hulk Hogan defeat AJPW's Stan Hansen, and stars such as Bret Hart, Tiger Mask, Jushin Liger and Andre The Giant appeared. No other large scale event involving multiple major promotions has been done since.