Hogan remained WWF World Heavyweight Champion for four years (1,474 days). In front of 33 million viewers, however, Hogan finally lost the title to Andre on the February 5 episode of The Main Event after a convoluted scam involving "The Million Dollar Man" Ted DiBiase and Earl Hebner (who assumed the place of his twin brother Dave Hebner, the match's appointed referee). After Andre delivered a belly to belly suplex on Hogan, Hebner counted the pin while Hogan's left shoulder was clearly off the mat. After the match, Andre handed the title over to DiBiase to complete their business deal. As a result, the WWF World Heavyweight Championship was vacated for the first time in its 25-year history because then WWF President Jack Tunney decreed the championship could not be sold from one wrestler to another. At WrestleMania IV, Hogan participated in a tournament for the vacant WWF World Heavyweight Championship to regain it; he and Andre were given a bye into quarter-finals, but their match resulted in a double disqualification. Later that night in the main event, Hogan came to ringside to stop Andre interfering which helped "Macho Man" Randy Savage defeat Ted DiBiase to win the title.  Together, Hogan, Savage, and manager Miss Elizabeth formed a partnership known as The Mega Powers. After Savage became WWF World Heavyweight Champion at WrestleMania IV, they feuded with The Mega Bucks (Andre the Giant and Ted DiBiase) and defeated them at the main event of the first SummerSlam. They then went on to feud with Slick's Twin Towers: Akeem and Big Boss Man.  In mid-1988, Hogan wrestled at house shows in singles competition with his "War Bonnet", a red and yellow gladiator helmet with a fist-shaped crest. This was notably used to give Bad News Brown his first WWF loss at a Madison Square Garden house show before it was discarded altogether. The War Bonnet gimmick was revisited in the WWE's online comedy series Are You Serious? in 2012.  The Mega Powers began to implode due to Savage's burgeoning jealousy of Hogan and his paranoid suspicions that Hogan and Elizabeth were more than friends. At the Royal Rumble in 1989, Hogan eliminated Savage from the Royal Rumble match while eliminating Bad News Brown, which caused tension, only to be eliminated by The Twin Towers himself. In early 1989, the duo broke up while wrestling The Twin Towers on the February 3 episode of The Main Event, when Savage accidentally collided with Miss Elizabeth during the match, and Hogan took her backstage to receive medical attention, temporarily abandoning Savage, who slapped Hogan and left the ring, where Hogan eventually won the match by himself. After the match, Savage attacked Hogan backstage, which started a feud between the two. Their feud culminated in Hogan beating Savage for his second WWF World Heavyweight Championship at WrestleMania V.  On April 2, 2005, Hogan was inducted into the WWE Hall of Fame class of 2005 by actor and friend Sylvester Stallone. At WrestleMania 21 on April 3, Hogan came out to rescue Eugene, who was being attacked by Muhammad Hassan and Khosrow Daivari. The build-up to Hogan's Hall of Fame induction and preparation for his WrestleMania angle was shown on the first season of Hogan Knows Best. The next night on Raw, Hassan and Daivari came out to confront and assault fan favorite Shawn Michaels. The following week on Raw, Michaels approached Raw General Manager Eric Bischoff demanding a handicap match with Hassan and Daivari. Bischoff refused, but told Michaels if he found a partner he would be granted a tag team match. Michaels then made a plea for Hogan to team with him. On the April 18 episode of Raw, Hassan again led an attack on Michaels until Hogan appeared, saving Michaels and accepting his offer. At Backlash, Hassan and Daivari lost to Hogan and Michaels.  Hogan then appeared on July 4 episode of Raw, as the special guest of Carlito on his talk-show segment Carlito's Cabana. After being asked questions by Carlito concerning his daughter Brooke, Hogan attacked Carlito. Kurt Angle then also appeared, making comments about Brooke, which further upset Hogan, who was eventually double teamed by Carlito and Angle, but was saved by Shawn Michaels. Later that night, Michaels and Hogan defeated Carlito and Angle in a tag team match; during the post-match celebration, Michaels performed the Sweet Chin Music on Hogan and walked off. The following week on Raw, Michaels appeared on Piper's Pit and challenged Hogan to face him one-on-one for the first time. Hogan appeared on Raw one week later and accepted the challenge. The match took place at SummerSlam, which Hogan won. After the match, Michaels extended his hand to him, telling him that he "had to find out for himself", and Hogan and Michaels shook hands as Michaels left the ring to allow Hogan to celebrate with the crowd.  Prior to WrestleMania 22 in April 2006, Hogan inducted friend and former announcer "Mean" Gene Okerlund into the WWE Hall of Fame class of 2006. Hogan returned on the July 15 episode of Saturday Night's Main Event with his daughter Brooke. During the show, Randy Orton kayfabe flirted with Brooke and later attacked Hogan in the parking lot. He later challenged Hogan to a match at SummerSlam, which Hogan won.  On October 27, 2009, it was announced that Hogan had signed a contract to join TNA on a full-time basis. The footage of his signing and the press conference at Madison Square Garden following it were featured on the October 29 episode of Impact!.  On December 5, 2009, Hogan announced on Ultimate Fighting Championship (UFC)'s The Ultimate Fighter that he would be making his official TNA debut on January 4, 2010, in a special live three-hour Monday night episode of Impact! to compete with WWE's Raw (which featured the return of Bret Hart). Dixie Carter revealed Hogan's role in the company in an interview with The UK Sun stating when his job came to question, "He is involved with everything from looking at the talent to how we shoot the show".  On the January 4 episode of Impact!, Hogan debuted, reuniting briefly with former nWo partners Kevin Nash, Scott Hall, and Sean Waltman, the latter two of whom made their returns to the company. He, however, refused to join them for a full-fledged reunion of their group claiming, "it's a different time", and stuck to his business relations with Bischoff, who made his appearance to declare that, the two of them would "flip the company upside down" and everyone would have to earn their spot. Hogan also encountered TNA founder Jeff Jarrett on the broadcast, appearing via video wall and interrupting Jarrett's company success speech, stating that Carter was instrumental to the company's survival, and that just like the rest, Jarrett would have to (kayfabe) earn his spot in TNA.  On the February 18 episode of Impact!, Hogan took Abyss under his wing, and during this sequence, gave him his Hall of Fame ring and claimed it would make him a "god of wrestling". Hogan made his in-ring return on March 8, teaming with Abyss to defeat A.J. Styles and Ric Flair when Abyss scored a pinfall over Styles. Afterwards, the returning Jeff Hardy saved Hogan and Abyss from a beat down at the hands of Styles, Flair and Desmond Wolfe. The storyline became a Team Flair versus Team Hogan situation, with Jarrett and the debuting Rob Van Dam joining Team Hogan and Beer Money (James Storm and Robert Roode) and Sting joining Team Flair. At Lockdown, Team Hogan (Hulk Hogan, Abyss, Jeff Jarrett, Jeff Hardy and Rob Van Dam) defeated Team Flair (Ric Flair, Sting, Desmond Wolfe, Robert Roode and James Storm) in a Lethal Lockdown match.

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