Donatello and April returned to Kurtzman's apartment and the journalist guessed they wanted to know the source of the mysterious tremors wrecking the city. He shows them his notes on the Kraathatrogon, the creatures who produce the mutagen, describing how the Kraang ride them by holding the antennae and can grow up to a hundred feet in length. ("The Manhattan Project, Part 2")
In Battle for New York, Part 1, he appears in an abandoned factory and acts as a benefactor for the The Mighty Mutanimals. Unfortunately, the Kraang track them down [by following them] and attack. Jack is shot and injured in the crossfire when he tries to recover data that he has on the Kraang's plans. Leatherhead carries him out when the turtles and Mutanimals retreat back to the pizzeria. He gives the turtles the data and tells them that they have to work together. Splinter, along with April and Casey, stay behind to take care of him and attend to his injuries.
- Kurtzman's name was given as "Kurtzen" in preliminary promotional materials. This was likely a typographical error, rather than a sudden name change.
- His name is based on Jack Kirby's real name, Jacob Kurtzberg. As well as his looks, with thick eyebrows, grey hair on the sides and other facial similarities.
- Kurtzman says the same distinctive quote in The Kraang Conspiracy and Battle for New York, Part 1 when the Kraang catch up with him: "They found me! I don't know how, but they found me!" This same line was famously spoken by the character Doc Brown in the film Back to the Future.