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Reigns made his main roster television debut on November 18, 2012, at the Survivor Series pay-per-view alongside Dean Ambrose and Seth Rollins, assaulting Ryback during the triple threat main event for the WWE Championship, allowing CM Punk to retain the title.
The trio declared themselves "The Shield" and vowed to rally against "injustice".
They denied working for Punk, but routinely emerged from the crowd to attack Punk's adversaries, including Ryback and WWE Tag Team Champions Team Hell No (Kane and Daniel Bryan).
This led to a six-man tag team Tables, Ladders, and Chairs match at the TLC pay-per-view, in which Reigns, Ambrose, and Rollins defeated Team Hell No and Ryback in their debut match.
The Shield continued to aid Punk in January 2013, attacking both Ryback and The Rock.
On the January 28 episode of Raw, it was revealed that Punk and his manager Paul Heyman had been paying The Shield and Brad Maddox to work for them.
The Shield then indistinctly ended their association with Punk while beginning a feud with John Cena, Ryback, and Sheamus that directed to a six-man tag match on February 17 at Elimination Chamber, which The Shield won.
The Shield had their first Raw match the following night, where they gained success against Ryback, Sheamus, and Chris Jericho.
Sheamus then formed an alliance with Randy Orton and Big Show to face the trio at WrestleMania 29, where The Shield emerged victorious in their first WrestleMania match.
The following night on Raw, The Shield attempted to attack The Undertaker, but were stopped by Team Hell No.
This set up a six-man tag team match on the April 22 episode of Raw, which The Shield won.
On the May 13 episode of Raw, The Shield's undefeated streak in televised six-man tag team matches ended in a disqualification loss in an elimination tag team match against Cena, Kane and Bryan.
On May 19 at Extreme Rules, Reigns and Rollins defeated Team Hell No in a tornado tag team match to win the WWE Tag Team Championship.
They made their first televised title defense on the May 27 episode of Raw, defeating Team Hell No in a rematch.
On the June 14 episode of SmackDown, The Shield's unpinned/unsubmitted streak in televised six-man tag team matches came to an end at the hands of Team Hell No and Randy Orton, when Bryan submitted Rollins.
Reigns and Rollins defeated Bryan and Orton at Payback to retain the WWE Tag Team Championship.
Further successful title defenses followed against The Usos on July 14 during the Money in the Bank pre-show and The Prime Time Players (Darren Young and Titus O'Neil) at Night of Champions.
On the September 23 episode of Raw, Reigns was pinned for the first time while on the main roster courtesy of The Usos when The Shield participated in and lost an eleven-on-three handicap elimination match.
In August, The Shield began working for chief operating officer Triple H and The Authority.
On the October 14 episode of Raw, Reigns and Rollins lost the WWE Tag Team Championship to Cody Rhodes and Goldust in a no disqualification match, following interference from Big Show.
At Hell in a Cell, Reigns and Rollins failed to regain the tag team title in a triple threat tag team match.
The first seeds of dissension were sown in The Shield (especially between Ambrose and Reigns) with Ambrose's boasting of being the only member left with a championship.
At Survivor Series, Reigns was the sole survivor for his team in the traditional five-on-five elimination tag team match after eliminating four opponents.
After losing to Punk in a handicap match at TLC: Tables, Ladders and Chairs, Reigns defeated Punk in a singles match following a distraction from Ambrose on the January 6, 2014 special episode of Raw Old School, making him the only member of The Shield to have beaten Punk.
At the Royal Rumble pay-per-view, Reigns entered the Royal Rumble match at number 15, and set the record for most eliminations in a single Royal Rumble with 12, as he eliminated both his Shield teammates, and was the runner-up in the match after being eliminated by Batista.
The next night on Raw, The Shield competed in a six-man tag team match against Daniel Bryan, Sheamus, and John Cena, with all three members of the winning team qualifying for the Elimination Chamber match for the WWE World Heavyweight Championship, which The Shield lost via disqualification after The Wyatt Family interfered and attacked Cena, Bryan, and Sheamus.
The Shield wanted revenge and a six-man tag team match for The Shield against The Wyatt Family at the Elimination Chamber pay-per-view was arranged, in which The Shield lost.
Despite more dispute, The Shield reconciled in March.
In March, The Shield began feuding with Kane, which turned all members of The Shield into fan favorites in the process.
Over the next few weeks, The Shield continued exchanging assaults with Kane, who was joined by The New Age Outlaws (Road Dogg and Billy Gunn), leading to a match between the two teams at WrestleMania XXX, which The Shield won.
The feud with Kane also prompted The Shield to sever ties with Triple H, who reformed Evolution to counter them.
The Shield defeated Evolution at both Extreme Rules and Payback.
After Batista "quit" WWE the following night on Raw, Triple H initiated his "plan B" which involved Rollins turning on The Shield and aligning himself with Triple H and The Authority.
