After the rise of teenage mutant ninja turtles movie after defeated the krang invasion they went to the sewers as they saw their little sister nikki still unconscious

As they put her on the med bay getting treatment for her injuries as raph brother instinct kicking in worried for his baby sister

Mikey: leo how is she as he asked both Donnie and leo his other two brothers about their little sister condition

Leo: well her shell is damaged crack so Donnie build a battle shell