Milly has a big, free-wheeling imagination. Her Cat has magical powers. Her father, the Inventor, welcomes her, her Cat and her friend Sam, into his Inventing Room. Together they make a formidable team! Milly's Aunt is visiting and doing what she likes doing best… tidying up the Professor's Inventing Room. When her vacuuming threatens his new Eat-Up-Your-Greens Machine, Milly invent a Contraption to distract her...