Shredder and Stockman-Fly in “Unfinished Business”

It's taking too long, Stockman. I grow severely impatient.

Sir, normal mutagen is unstable and can warp your mind. With this new mutagen serum, I can control the outcome but it will take time.

Time is what I do not have. Every moment that passes, I lose more control over this city. My henchman have grown useless. Eh. It is ironic that my most loyal servant is nothing but a lowly housefly. After everything I must completely rely on you, Stockman.

Thank you, Master. I will not let you down.