In Victorian London, England, a little mouse girl’s toymaker father is abducted by a peg-legged bat. She enlists the aid of Basil of Baker Street, the rodent world’s answer to Sherlock Holmes. The case expands as Basil uncovers the crime’s link to a plot against the Crown itself.

The Autobots must stop a colossal planet-consuming robot who goes after the Autobot Matrix of Leadership. At the same time, they must defend themselves against an all-out attack from the Decepticons.