S1·E8 Skeleton Key

DBK's family's found a mysterious power source that will allow the brute to reclaim his former glory. But the strange item is locked behind an impervious ancient gate that needs a key... the same key that was given to MK as a 'thank you' for saving the city over and over. Now, it's a game of cat and mouse as DBK's family tries to get the key and our heroes attempt to keep it out of their hands.