Board Thread:Theories and Rumors/@comment-30938718-20180224154538/@comment-30938718-20180225122655

LegoNexoKnights101 wrote: I don't know.

Other villians haven't come back.

Neither have many good guys (Skylor, Misako, etc)

The only person really who seems to be coming back is Garmadon. Maybe he will return in later episodes.