Slash (IDW)

Slash is an experiment of StockGen Laboratories's that is freed due to April O'Neil's diversion to grab their Turtle Tracker. He punches out one of General Krang's Rock Soldiers and escapes the lab into the night. Before leaving, he takes a miniature palm tree from the tank.

Prior to his escape, Slash, then called Specimen 6, was a snapping turtle that was injected with mutagen from Old Hob's DNA to turn him into another mutant to hunt down the Turtles and Splinter. As Specimen 6's size and strength increased, his mind became unstable and he turned savage which led him to be contained.

After his escape from Stockgen's, Specimen 6 lurked around New York as a mindless monster damaging property, scaring, and injuring people. The beast was called "Slash" for his slashing rampage. Slash's latest attacks were striking at Michelangelo's pizza delivery friend Woody with minor injuries and leaving claw marks on April's van.

Slash spotted the Turtles and decided to follow them after ripping off the black shirt of a thug the Turtles have just beaten and turning it into a mask similar to the Turtles. He followed them all the way to an abandoned church which the Turtles take as their new home. Slash then starts to attack them in the basement of the bunker shelter of the church. His strength and speed were too much for the Turtles even when they temporarily subdue him. When Slash was about to kill an unconscious Michelangelo, Leonardo threw a shuriken at him to get his attention. Leo tried to reason with Slash that they were experimented on at Stockgen's too, but the reckless beast jumped him and was accidentally impaled by one of Leo's swords. Slash pulled out Leo's sword and ripped off his mask then fell into the sewer system of the basement as he gave in to his wound.

Slash is revealed to have survived and is washed ashore. He is awakened by Old Hob, who somehow survived being shot by Baxter Stockman, Hob tells Slash that they should team up together to get revenge on Stockman and everyone else at Stockgen.