Operation: Break Out

If his brothers didn't believe in him, Donatello figures that he had to prove himself. Thankfully, Donatello had managed to decipher the encoded audio clip. It might have been foolhardy, maybe even monumentally stupid for the turtle that was meant to be the smart one, but Donatello was on a mission. A mission of love! If he managed to find and rescue Kirby O'Neil all on his own, then August would have to like him!

Right?

Donatello had located a Kraang base hidden in plane sight in Chinatown, fought his way through a group of heavily-armed Kraang and eventually finding Kirby.

He was even able to open the door on his cell... and every other cell in the holding facility. By the time he had gotten to Mr. O'Neil, the two of them were on the run from some kind of humanoid salamander monster.