After another time accident, the exchange students with their two new friends must work with Basil in order to stop the nefarious criminal mastermind, Professor Ratigan, from ruling all of mousedom!
- Antagonist: Professor Ratigan
- This is the first full speaking appearance of Professor Ratigan, Basil, Olivia, Dawson, Flaversham, and Fidget.
- This is the first time both Hiram and Ratigan meet, starting their rivalry from one another.
- We learn that Ratigan survived due to Hiram's blabbing to the Black Bottom Harlet, Katalina whom saves his life.
- Katalina, despite appearing, only appears throughout the shadows.
- Epilogue of episode, despite timeline settings, take place after Season 2.