Guppies: Good morning Mr...Grumpfish?!

Mr. Grumpfish: What's so good about it.

Molly: Uh, Mr. Grumpfish? What are you doing here?

Gil: Where's Mr. Grouper?

Mr. Grumpfish: He's at the dentist. I'm your substitute.

Deema: Substi...what?

Mr. Grumpfish: Substitute teacher.

Nonny: A substitute is a teacher that takes care of you when your regular teacher's away.

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