Originally Posted by ChosenOne

The Foot would've been wiped out in the Burnow battle if it hadn't been for the Turtles forcing Krang to retreat and then defeating him "behind the scenes". If you add another Utrom in a battle suit to guard the Technodrome, they'd all be dead. Don't forget Krang had an army of his own. Bebop and Rocksteady might tip the scales, but they wouldn't have been enough to keep the Technodrome from being activated, and then it's game over for Earth. The only one who could possibly constitute a spanner in the works was Stockman, but even then we saw how swiftly and easily Krang dealt with his betrayal.