IWGPジュニアタッグ王座
Following his departure from TNA, New Japan announced on August 13, 2012, that Shelley would be returning to the promotion the following month. Before Shelley's return to Japan, he and A.J. Kirsch unsuccessfully challenged Forever Hooligans (Alex Koslov and Rocky Romero) for the IWGP Junior Heavyweight Tag Team Championship on August 26 at a Sacramento Wrestling Federation (SWF) event in Gridley, California. Following the match, Kushida saved Shelley from a beatdown at the hands of Koslov and Romero. Shelley wrestled his New Japan return match on September 7, when he, Bushi, Máscara Dorada and Ryusuke Taguchi were defeated in an eight-man tag team match by Alex Koslov, Averno, Low Ki and Rocky Romero. Afterwards, Shelley continued teaming with Kushida with the two forming the tag team "Time Splitters" and scoring several wins over Koslov and Romero in multiple man teamed matches, after debuting their new double-team finishing maneuver, the "I-94". On October 8 at King of Pro-Wrestling, Time Splitters unsuccessfully challenged Forever Hooligans for the IWGP Junior Heavyweight Tag Team Championship. On October 21, the Time Splitters entered the 2012 Super Jr. Tag Tournament, defeating Jado &amp; Gedo in their first round match. On November 2, Shelley and Kushida defeated Suzuki-gun (Taichi and Taka Michinoku) to advance to the finals, where, later that same day, they defeated Apollo 55 to win the tournament and become the number one contenders to the IWGP Junior Heavyweight Tag Team Championship. On November 11 at Power Struggle, the Time Splitters defeated Forever Hooligans in a rematch to win the IWGP Junior Heavyweight Tag Team Championship. Time Splitters made their first successful title defense on February 10, 2013, at The New Beginning, defeating Forever Hooligans in the third title match between the two teams. Their second successful defense took place on March 3 at New Japan's 41st anniversary event, where they defeated Jyushin Thunder Liger and Tiger Mask. On April 5, Shelley received his first shot at the IWGP Junior Heavyweight Championship, but was defeated by the defending champion, Prince Devitt. Two days later at Invasion Attack, Time Splitters defeated Devitt and Ryusuke Taguchi for their third successful defense of the IWGP Junior Heavyweight Tag Team Championship. On May 3 at Wrestling Dontaku 2013, Time Splitters lost the IWGP Junior Heavyweight Tag Team Championship back to the Forever Hooligans in their fourth defense.