Amir is pumped! It's Superhero Day at Misfits Academy, and Power Core is among the featured guests. But meeting his favorite superhero soon takes a back seat when Amir and his friends make a shocking discovery. Power Core and his fellow heroes have been shrunk! Who is behind these incredible shrinking heroes? And why are they being held captive in high-tech glass jars? Young readers will find out in this fun and funny chapter book bursting with colorful comic book-style illustrations.