The book in hand, Jeremy, Robin and Nicole start their research. Turns out Bulshar, before he took human form, was the snake from the Garden of Eden. Charlie, Waverly's father, was the angel protecting the garden (obvi he didn't do too good a job at it). It would take 120 years or so for the time to be right for the garden to become vulnerable to another incursion... and that's coming up. Also, Robin gave Bobo his headphones, and he's blissing out on jazz.