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Let's see I think that if Adventure Time had a spin-off/new series it would revolve around Shermey and Beth and the "new OOO". As for Betty, I think it would be cool if she had her own story arc within this hypothetical spin-off. What would be neat is that if Betty was Golb in the beginning episodes/seasons than she could find a way to disban from Golb, either killing him or sending him back into space. After her disman from Golb she would probably reminisce for Simon and want to bring him back from the dead. For the Lich I don't really think he had anything to do with Golb. He didn't seem like he was the type of guy to take orders from someone, ya know? So no, in my opinion, the Lich didn't work for Golb and he wasn't any type of scholar.
Looking forward to hearing more from you and thank for asking my opinion!