On June 14, Major League Wrestling announced on its website that a new era incarnation of the famous Hart Foundation was going to begin which would consist of Hart family members Teddy Hart and Davey Boy Smith Jr. alongwith Brian Pillman Jr., the son of Brian Pillman, a former member of a previous incarnation of Hart Foundation. Pillman made his televised debut in MLW on the August 3 episode of Fusion, where he showed respect to Kevin Sullivan accepting him as his mentor. Hart Foundation made its debut on the August 17 episode of Fusion as a trio with Pillman acting as the cornerman of Hart and Smith, who defeated ACH and Rich Swann after Pillman hit Swann with his cane. The trio established themselves as a villainous group and ranted against MLW management, which included Pillman turning on his mentor Kevin Sullivan and attacking him along with Hart and Smith on the August 31 episode of Fusion. Hart Foundation would dominate competition as they went on to defeat The Stud Stable and the team of ACH, Rich Swann and Marko Stunt on Fusion. The team would soon find championship success as Hart won the vacant World Middleweight Championship by defeating Dezmond Xavier, El Hijo de L.A. Park, Gringo Loco and Kotto Brazil in a five-way ladder match on the first-ever live episode of Fusion on December 14. Pillman and Smith continued to succeed in tag team competition. The winning streak of Hart Foundation earned them a title shot for the World Tag Team Championship against The Lucha Brothers at SuperFight on February 2, 2019, which Smith and Hart won, thus making Hart a double champion. Pillman was also recognized as a champion via the Freebird rule, which required any two of the three members to defend the titles. On the February 16 episode of Fusion, Hart successfully defended the World Middleweight Championship against MJF, after which Richard Holliday joined MJF in attacking Hart. As a result, Holliday and MJF formed an alliance called The Dynasty and began feuding with Hart Foundation, which led to Hart Foundation turning into a heroicstable. Smith and Hart defended the World Tag Team Championship against Dynasty on the March 16 episode of Fusion, where Dynasty was disqualified after Alexander Hammerstone joined Dynasty by attacking the Hart Foundation, beginning a lengthy feud between the two stables. On the April 27 episode of Fusion, Hart Foundation suffered their first loss as they were defeated by the Dynasty in a six-man tables match. Pillman and Hammerstone would qualify for the finals of a tournament to crown the inaugural National Openweight Champion at Fury Road, which Hammerstone won. Pillman and Hart would lose the titles to Dynasty in a ladder match on the July 13 episode of Fusion. Smith and Hart received a rematch for the titles in a two out of three falls match against the Dynasty on the September 21 episode of Fusion, in which they were unsuccessful due to interference by Austin Aries, who demanded a World Middleweight Championship title shot against Hart. The three members of the Hart Foundation would go on to compete in separate singles matches at Saturday Night SuperFight, where Hart successfully defended the World Middleweight Championship against Austin Aries, Smith failed to win the National Openweight Championship from Alexander Hammerstone and Pillman lost to Low Ki. On the November 11 episode of Fusion, Hart lost his title to Myron Reed after Contra Unit member Josef Samael threw a fireball on Hart. This would mark Hart's final appearance in MLW as he was released by the promotion on December 6. Smith and Pillman were both entered into the Opera Cup tournament, a family heirloom handed over to MLW management by Teddy Hart as the Opera Cup trophy had been won by his grandfather Stu Hart in 1948. Smith and Pillman made it to the final round of the tournament, which Smith won.
