Super Potato's Middle Ages Adventure: Book 10

Super Potato has lost his giant muscles! To take his mind off this tragedy, he agrees to a time-travel mission.
Soon he's searching the Middle Ages to find a scientist stranded in the past. In the foggy swamp of an older era, our hero meets a brave, handsome knight who turned into a serpent. (Say, that sounds familiar . . .) Super Potato agrees to help the knight too, leading to a quest to find the lost scientist and a legendary sorcerer.