Ryan made his WWE television debut on the January 17, 2011 episode of Raw by interfering in a match between CM Punk and John Cena. Following his interference, Punk presented him with a 'Nexus' armband, inducting him into the group. Ryan then participated in the 2011 Royal Rumble match. On February 7, Ryan had his debut match on Raw when he lost to R-Truth via disqualification. In late February, it was announced that Punk would face Randy Orton at WrestleMania XXVII, with each member of The Nexus facing Orton to win the right to accompany Punk to the ring in the weeks leading up to WrestleMania. Ryan was the final member to face Orton, but lost on the March 14 episode of Raw. Following the match, Orton punted Ryan in the head. He was absent from television for nearly a month, making his return on April 11 on Raw with the other New Nexus members, attacking Orton and preventing him from earning a WWE Championship match. On May 2, Ryan lost to Kane by disqualification following interference from Punk, and went on to attack both Kane and Big Show. At the Over the Limit pay-per-view on May 22, Ryan and Punk challenged Big Show and Kane for the WWE Tag Team Championship, but were unsuccessful. The following month, Ryan suffered an injury and was absent from television to recuperate.
Ryan returned from injury at a house show in Jackson, Mississippi in late August. He made his television return on 8 September episode of WWE Superstars, defeating JTG. On 26 September, on Raw, Ryan was chosen by Vickie Guerrero as the partner for Jack Swagger and Dolph Ziggler in a six-man tag team match against Zack Ryder and Air Boom (Evan Bourne and Kofi Kingston), but Ryan turned on Swagger and Ziggler, turning Ryan face and allowing Ryder to pick up the victory for his team. The following week on Raw, Ryan teamed with Air Boom, Sheamus, CM Punk, and John Cena in a 12-man tag team match to defeat the team of Alberto Del Rio, Christian, Cody Rhodes, David Otunga, Ziggler, and Swagger. Ryan began feuding with Ziggler, with the pair trading wins via disqualification. Ryan was part of Team Orton at the Survivor Series pay-per-view in November, where he was eliminated by Cody Rhodes.
He appeared only sporadically on television throughout 2012, and he then rejoined the re-branded developmental system. NXT. He returned to the ring and debuted on the rebooted WWE NXT show and began his singles winning streak on 30 January 2013, by defeating Sakamoto. Ryan then entered into a feud against Enzo Amore and Colin Cassady; although he easily defeated them in singles matches, he lost to them in a handicap match. Mason was then rarely used on WWE television until he had his final televised match on 24 April 2014 episode of NXT, in a losing effort to the number one contender for the NXT Championship, Tyler Breeze. On 30 April 2014, it was reported that Ryan had been released by WWE.