The only episode to contain all 15 series regulars.
Stick tells the team to hide in the sewers. The Teenage Mutant Ninja Turtles, who live in the sewers, is in part a spoof of the Daredevil comics. Splinter is based on Stick, and the Foot is based on the Hand.
Upon seeing Matt in costume for the first time, Jessica says "Nice ears". This is a reference to the resemblance between Daredevil's horned cowl and Batman's, which has bat ears.