Susan's been having very bad dreams, and without Tucker there to comfort her, she's afraid something terrible has happened. He's been ordered to stay in Cat City and do his duty as a gatekeeper, but it feels like the council is trying to keep him from his friend.

It turns out Susan's nightmares are real, however, and when Tucker discovers Susan has been kidnapped by their enemies, he tries to rally help from the cats. But if anyone is going to save her, it's going to have to be him! With the Rat King ready to attack and an old enemy still plotting to take over Cat City, it's up to Susan and Tucker to save the cats from their enemy one more time.