April 2 - The night after WWE WrestleMania XXVIII Brock Lesnar returned to the WWE after a 8-year absence and F-5'd John Cena.
April 29 - WWE Extreme Rules at the AllState Arena in suburban Chicago: John Cena defeated Brock Lesnar in an extreme rules match.
April 30 - On Raw, WWE's Chief Operating Officer Triple H refused to give in to Brock Lesnar's unreasonable contract demands, starting a feud between the duo and resulting in Lesnar attacking Triple H and breaking Triple H's arm.
August 13 - On Raw Shawn Michaels would arrive to state he would be in Triple H's corner at SummerSlam but Brock would arrive and confront Michaels and break his arm.
August 19 - WWE SummerSlam at the Staples Center in Los Angeles: Brock Lesnar would defeat Triple H.
April 7 - WWE WrestleMania XXIX at MetLife Stadium in East Rutherford: With his career on the line Triple H defeated Brock Lesnar in a "No Holds Barred" Match.
May 19 - WWE Extreme Rules at the Scottrade Center in St. Louis: Brock Lesnar defeated Triple H in a steel cage.
December 30 - On Raw, Brock Lesnar returned with Paul Heyman to announce his intentions to challenge the winner of the match between Orton and Cena. Lesnar then called out any wrestler who wanted to stop him, which resulted in Mark Henry answering the challenge and the two brawling until Lesnar ended the brawl with an F-5.
January 6 - On Raw, Mark Henry challenged Lesnar again only to have Lesnar dislocate his elbow with the Kimura Lock. Following this, Big Show came out and confronted Lesnar, which lead to a short physical confrontation between the two.
January 26 - WWE Royal Rumble at the CONSOL Energy Center in Pittsburgh: Brock Lesnar defeated the Big Show.
February 24 - On Raw, a returning Brock Lesnar, along with his manager Paul Heyman, showed up to Raw to voice their complaints about not having Lesnar in the title match at WrestleMania. To appease them, Triple H gave them a contract which allowed Lesnar to challenge anyone to a match at WrestleMania as long as it did not involve Orton or Batista in the title match. Neither Lesnar nor Heyman wanted anything to do with the open challenge and decided to leave as they felt that anyone else would not be a big enough challenge. As if to respond to that statement, The Undertaker returned and stared Lesnar down, signaling him to challenge his undefeated WrestleMania streak. Lesnar signed the contract and pressed the pen against Undertaker's chest for him to sign, Undertaker answered by stabbing the pen into Lesnar's hand and chokeslamming him through the conference table.
April 6 - WWE WrestleMania XXX at the Superdome in New Orleans: Brock Lesnar defeated The Undertaker thus ending The Undertaker's undefeated streak at Wrestlemania events at 21-1.
July 21 - On Raw, Brock Lesnar returned to the WWE and was chosen by WWE COO Triple H to face Cena at SummerSlam for the championship.
August 17 - WWE SummerSlam at the Staples Center in Los Angeles: Brock Lesnar delivered 16 suplexes and 2 F-5's to defeat John Cena and capture the WWE World Heavyweight Championship in one of the most one sided title matches in WWE history.