|First appearance:||"Squidtastic Voyage"|
|Latest appearance:||"Suction Cup Symphony"|
|List of objects|
Squidward's Brain is a sad, angry brain in Squidward's head. It has appeared in four episodes: "Squidtastic Voyage," "Breath of Fresh Squidward," "Suction Cup Symphony," and "What Ever Happened to SpongeBob?"
In "Squidtastic Voyage," it is among Squidward's organs seen by SpongeBob and Patrick after they go inside Squidward to find his clarinet reed.
At the end of "What Ever Happened to SpongeBob?" after SpongeBob returns to Bikini Bottom, Squidward somehow is able to open his head, and he throws his brain in the garbage can.
At the beginning of "Breath of Fresh Squidward," it rains because of his anger, but later, when he gets an electric shock and becomes happy, a rainbow appears.
In "Suction Cup Symphony," Squidward's brain is again raining, but the rain halts and is replaced by a rainbow when Squidward comes up with a good musical symphony.
- Inside is a worm, which does not like rain.
- Squidward's brain only has one Happy Gland.
- In "Keep Bikini Bottom Beautiful," it is revealed that one of Squidward's brain veins says, "I AM ANGRY."
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