Splinter and Karai in “Unfinished Business”

Not what you expected?

I admit it's a little weird being with...people I was told were my enemies. What really happened between you and Shredder and my mother?

I'm afraid it goes much deeper than our rivalry over your mother. The bitter feud between the Hamato and Foot clans lasted centuries. Oroku Saki was the son of the enemy. But he was just a child, so my father gave him shelter. We were raised as brothers, and rivals in all things as brothers are. But that rivalry soon turned bitter when we met Tang Shen- your mother. Jealousy became hatred when Saki learned of his true heritage. He swore vengeance and rebuilt the Foot clan. One night, Oroku Saki struck. The blow that was meant for me struck your mother instead. Shredder blamed me and in his rage, he burned our home to the ground, leaving me to my fate. He took you away from me.

After all this time, I have learned that revenge only leads to more pain.

But I seen you fight, Father. You could take him out.

We are safe here. And we are finally together again, my daughter. That is all that matters now. Not revenge.