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Some TMNT stuff really isn't for little kids. |
In the IDW continuity, there is a gang of four mercenaries who work for Null Group as elite soldiers. Enhanced with cybernetic implants, they are human-born mutants who can use machines to regulate the mutagen levels in their bodies, allowing them to shift between human and mutant form at will. Their call signs are Deadaim, Fist, Lynch and Waster, with Colonel Fist as commander.
In The Jersey Devil, Madame Null hires them to hunt down Dreadmon for recruitment, and come into conflict with Dreadmon as well as Man Ray and Sally Pride of the Mighty Mutanimals who are also seeking to recruit Dreadmon. The Jersey Devil
After the destruction of Jasper Barlow's lab and clinic, Barlow assured Null that he was still on track to providing results to her, as he was able to secure a bag of Donatello's blood from the wreckage. This blood and some mutagen was used in the Gang of Four's mechanisms used to mutate them on-demand to transform them into fake Turtles for the purpose of impersonating the real ones as a false flag.
Baxter Stockman hired Darkwater to be his own personal security detail, feigning ignorance of these Turtles' true identities and pretending that they intend to asssassinate him. During a speech regarding his official mayoral stance on Mutant Town going forward, the Impostor Turtles did indeed strike and threaten Stockman's life. However, before Darkwater could move to subdue the attackers, Stockman called them off, telling the Turtles they could return to Mutant Town unharmed if they let him go. This confused the Turtles and everyone else involved, including Darkwater and NYPD officer Kara Lewis. "Leonardo" (Fist) shoved Stockman and they disappeared by use of smoke bomb. Lewis and Wesley Knight of Darkwater, who had encountered the Turtles many times before and were familiar enough with them to know them by their weapons, were also confused to hear the sai-wielder "correct" Knight when he called him Raphael, saying he was Leonardo instead. The Armageddon Game #1, TMNT #133, The Armageddon Game #2
Following the assassination attempt, the Impostor Turtles came across Karai running along rooftops and trailed her for a while before making their presence known with a shuriken. Lost in her own thoughts, she was unaware of them monitoring her. Karai and the Turtles fought, and even though the Turtles got in some licks, Karai was able to overpower them as they were not well-trained. Before she could get information out of them regarding their threat on Stockman's life, the police arrived and spooked them off. The Alliance #1
When the Null Turtles captured Sally Pride and intended to free Man Ray, Ray realized that he and Sally had met these fake Turtles before. After Ray shot Waster with his stingers and punctured his mutation device, they fled, with him regressing to human form. Ray told Hob and Raphael of their previous dealings with the Gang of Four The Armageddon Game #4
Venus may potentially have witnessed the Null Turtles fighting the Earth Protection Force outside the Mutant Town wall some point after regrowing her arm. Free Comic Book Day 2022