Board Thread:Theories and Rumors/@comment-30938718-20180720095904/@comment-30938718-20190101101756

Emperor Serpentine wrote: I just remembered that the Oni Mask of Vengeance still exists. Also, we never saw Killow get captured by the police.

Season 10: Killow's Revenge?

TBH I think they caught him off-screen and broke the mask. Now we know he was captured thanks to the Legacy shorts.