Leo and Donnie disagree about their plan to stop the Kraang invasion. When Leo makes a critical mistake, he is separated from the team and Donnie must step up as a leader.
Leo Raph and Donnie get into a fight about how to stop the invasion, April and Leo make critical mistakes, Leo gets EXTREMLY injured after his critical mistake, and it's Aprils fault that the invasion happened. Also something bad happens to Master Splinter.