Groundhog is a mutant groundhog and a member of the band DIGG. She is obsessed with digging and saying the word "dig."
DIGG tried to strategically detonate four support pillars in order to submerge a stadium so they could play to a captive audience. Unfortunately, the four pillars happened to be under the Ninja Turtles' favorite pizza parlors, leading the brothers to believe DIGG had a personal vendetta against them. Upon learning DIGG's actual plan, they convinced them to play as the in-house band of the new Bro's Pizza pizzeria, which had been opened by all four proprietors of the previous pizzerias.