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Nightmare Sheenario is the first segment of the 23rd episode of Planet Sheen.
While running away from Princess Oom, Sheen sneaks into the Empress' room and wakes her up. When the Empress starts nagging and bossing everyone around, the Emperor threatens to punish Sheen unless he finds a way to get her back to sleep.
- This is the only appearance of the Empress and the only time someone brings her up.
- It is revealed that the Empress sleeps every day of the year and once a year, she comes out all beautiful and sweet. But when she's woken up prematurely, she's ugly and horrible.
- This is the last episode to feature Princess Oom.