Splinter's Spirit, Leo and others in “Unfinished Business”

Do not be sad, my son.

Father.

Leonardo, I know you feel the weight of leading your family. But, remember: I am always with you.

Sensei, we're facing something we never encountered before. And I can sense something really bad on the horizon. What can I do?

Find the light within. It is the only thing that can save you against these creatures of darkness. These beings are not what they appear to be.

Then what are they?

What are what? Who are you taking to, Leo?

It was... no one. Come on, let's head out.