Invincible (2021)

For anyone unfamiliar with the comic book (or Robert Kirkman's other work), this first episode might make you think this is a bright and colorful Saturday morning cartoon. Then Omni-Man attacks the Guardians of the Globe in the episode's closing minutes, and the moment he slowly and graphically crushes Red Rush's skull into bloody paste is the moment you realize it isn't.

Example of:
Establishing Series Moment