2) Hulk Hogan - WWE, WCW, NJPW & IMPACT Wrestling
There might not be a bigger name in WWE history than Hulk Hogan. The Immortal One was the top star of the first boom period for the company. Hogan defeated Iron Sheik to become the WWE Champion in January 1984 and held the title for the next four years. He put on legendary feuds with Paul Orndorff, Andre The Giant and Macho Man Randy Savage that helped the promotion rise to prominence.
Hogan eventually left the company in 1993 after losing the WWE Championship to Yokozuna at King of the Ring. A year later, he signed with WCW under the same ring name that became famous in Vince McMahon's promotion. He took his fanbase and helped the competition become a mainstay in the industry.
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Hulk Hogan caused a second boom period as a heel, this time in the iconic New World Order stable with Scott Hall and Kevin Nash. After winning the WWE Championship five times, Hogan won the WCW Heavyweight Championship on six occasions. Hollywood Hogan eventually did return to WWE for one more run with their top prize as well.
In 2010, Hulk Hogan showed up at IMPACT Wrestling along with Eric Bischoff to help Dixie Carter run the company. Despite the much maligned stint there, he kept his trademark name in tact with yet another promotion. Hogan made appearances for NJPW during his time in WWE under the same ring name, making him one of the few to keep his name in four major companies.