ok so i was browsing the wiki couple of minutes ago and i saw DIS pic. i knew it was farmworld finn before i even clicked on it. though i cant seem to wonder who's that skeleton guy. it was obviously farmworld jake coming out of green goo. but when he came out he looked like regular jake. then. it hit me. like a ton of brix. this MUST be how he got his powers!
though its just a guess. your predictions in the comments section :3