Night of the Dark Turtle

S7 E14: While Donatello and the other three Turtles debate the issue of "brains vs. brawn", Donatello's Early Warning Alarm System goes off. According to Donatello's readings, The City has experienced a major vibration emanating from the Earth. Naturally, everyone suspects Shredder and Krang, so they set out to investigate immediately. Donatello's readings lead them to a Government Research Lab, where only moments ago Shredder received a Micro Blaster from one of the resident scientists. The Blaster is supposedly the mightiest (and smallest) weapon known to man. During a fight scene, Donatello is seriously hurt by Shredder. And while Shredder eludes the Security Guards (without his Micro Blaster), the Turtles also retreat back to the lair with a semi-conscious Donatello.