As a child, her father used the Ninja Turtles and Splinter as test subjects for his mutagen experiments, with April treating them as her pets, feeding them pizza when they were little. After her father destroyed his lab, she placed the Turtles and Splinter near a sewer grate.
As an adult, she worked in journalism at Channel 6, but felt that her talents were under-utilized reporting on relative puff pieces such as a new sports movement. While trying to follow up on an attempted story of stolen chemicals from a docking port, she first witnessed the Turtles active as vigilantes, later finding them when they thwarted a Foot Clan attempt to take hostages in a subway station. After hearing their names, she realized their ties to her father's work, but revealed the truth to Eric Sacks before the Turtles and Splinter could warn her of his real agenda.
After Leonardo, Donatello and Michelangelo were captured, she helped Raphael dig Splinter out from the rubble before helping Raphael reach the Sacks estate, giving the other Turtles a dose of adrenaline to help them escape their cages. She even managed to land the final blow on Shredder in the final battle, kicking him off the antenna of Sacks Tower after the tip was knocked over during their fight. Despite the Turtles being a ground-breaking story, April kept their secret, noting that she considered them her family.
A younger version of April appears in the movie and is played by Malina Weissman.