I agree with Camelot also. I think whatever portal Hook & Emma use to get back to SB, someone else unknowingly is going to end up tagging along, possibly the next big bad. :o)
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Nothing is impossible on OUAT. Everything has a way of repeating itself. Keeper of the Keeper tread: https://oncepodcast.com/forums/topic/official-keeper-thread-3/#post-217924