Teenage Mutant Ninja Turtles (2003) - Season 1 Episode 25 -

As the Turtles continue their search for Splinter, they turn their attention to the Guardians. The trail soon leads them to a building marked as "TCRI" - the same letters on the canister of ooze responsible for their mutation! Now with two reasons to infiltrate that building, the Turtles recruit both April and Casey to help get them inside.