Does “dark” here mean “scary”?
Yes. In this video, the monster asks powerpuff girls "Do you girls even know what scary means?". Then, blossom starts to talk about scary stories to the monster and tell him "Sorry if I got too dark here". Therefore, in this context, "dark" does mean "scary". However, people in general use "dark" to indicate "depressing", not scary. Ex: Many teenagers are not ready to face the dark future.
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