This was a cute middle-grade book that was actually pretty complex as well.

The plot really is exactly what the title says it will be. Right at the beginning Brainiac arrives and thinks that taking over the world will be easy because Superman is off world. Instead, Supergirl appears and they fight for most of the book.

The interesting part came when Brainiac went into Supergirl's brain and suddenly the book was talking about Neurons and Neural connections (called it electricity, but, nothing's perfect). It was awesome and really nerdy for a middle-grade Supergirl book. Very cool. ( )