While serving with Smith, Tarr comes into contact with Shang-Chi and the small band of adventurers fighting a covert war against the antagonist of the story, Dr. Fu Manchu.

[volume & issue needed] This group includes the characters of Leiko Wu and Clive Reston[1] who will later become two of his closest friends.

[2] When Fu Manchu is finally defeated, Black Jack Tarr becomes part of Freelance Restorations, a group of private adventurers.

During a case where Tarr was tracking down the seemingly kidnapped daughter of family friends, Mandy Greville, he came to New York to investigate the cult Dawning Light.

[volume & issue needed] Mandy is taken to Stormhaven Castle where several of Smith's colleagues attempt to bring her back to normalcy.

[volume & issue needed] Tarr's group comes under attack by Comte de Saint Germain, who in the reality of Marvel Comics, is a seeming immortal who inherits the killers and cultists and resources of Fu Manchu.

Tarr tips off Lin Sun to Shang-Chi's location when he and the Sons of the Tiger arrive in London to help their friend and the Daughters of the Dragon.

After Midnight Sun's ritual with the Mao Shan Pai causes a citywide electrical interference, MI-6 tracks the energy source to White Dragon's estate outside London, where Tarr deduces Shang-Chi is.

[4] After Shang-Chi assumes leadership of the Five Weapons Society and acquires the Ten Rings, Tarr dispatches Leiko and Reston to keep Shang-Chi preoccupied with a fake rescue mission while he and his men extract the Rings from their secure vault, as MI6 does not trust the Society with safeguarding the weapons.