like got thier planet destroyed, got thier dad killed by his arch nemesis, lost their dad multiple times , Leo was in a coma for like 3 months and they didn't even know if he was gonna make it, New York got invaded by krang, April's bsf and like one of her only friends turned out to be an alien robot, Donnie got fucking disintegrated by April, they also lost fugitoid who was basically a second dad to them after loosing splinter,the time where Mikey also lwk exploded, Leo sacrificing himself...
