It Came from Beneath the Sewers (S02E03)

After discovering that a mutant plant has had its growth accelerated by the first fragment of the Eye of Sarnoth, Shredder unleashes it on the city to attack the Turtles. Meanwhile, April is lured into a trap by Shredder, and is immediately captured. However, the Turtles disguise themselves as pizza delivery boys and free her, though Shredder escapes, again, with the fragment, while the Turtles must destroy the mutant plant that is wreaking havoc on the city. (iTunes)