Skeleton Key Monkie Kid : Season 1 Episode 8

Demon Bull King’s family has found a mysterious power source that will allow the brute to reclaim his former glory. However, whatever this strange item is, it’s locked behind an impervious ancient gate. A 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.