Despite having no rewards of its own, beating this stage is required to access most non-Uncanny Legends stages that feature the Aku Altar base, which is indicated by the message "Aku Altars Appear! Your Aku Research is complete and the Gates of Aku have opened! Visit Empire of Cats to enter this dark realm..."
- 1 Wicked Cat spawns after 13.33 seconds400f.
- 1 Wicked Tank Cat spawns as the boss after 13.33 seconds400f.
- 1 Wicked Axe Cat spawns after 13.33 seconds400f.
Let Wicked Cat get close to your base, then attack him with long-ranged attackers such as Crazed Bahamut Cat, Ururun Cat, King Dragon Cat and Crazed Lizard Cat, all the while spamming Crazed Macho Cats, Crazed Wall Cats and Eraser Cats. If you still can't win, use a Rich Cat.
|Empress' Call to Arms: Liberate the corrupted Cats!
Clear "Unleashing the Cats" (the gates open...)
|100 Cat Food|
- It is the only event stage to have no time limit.
- Within the game's code, there is a placeholder stage that is the exact same as Taking the Stage (Insane).