In "Doofenpus:" Phineas and Ferb build a device to make solid things liquid in order to check out new flavors for truly exotic smoothies. Dr. Doofenshmirtz figures to beat Perry the Platypus on his level by turning himself into a platypus, whereby an evenly matched battle ensues. In "Norm Unleashed:" Norm is left in charge and commanded to "show initiative" when jury duty summons Dr. Doofenshmirtz away. Unhampered by Inators or ineptitude, Norm becomes a true menace to the city and a formidable foe for Perry by making himself the ultimate weapon. Meanwhile, Candace has difficulty trying her bust her brothers on nano-bot technology as the nano-bots keep refashioning themselves into different things.
—statmanjeff