Season 2 Episode 3 Scene 10 Science Fair
Scene: Arkham's streets
The camera focuses in on a store window where TV's are playing an add for Guardians of the Galaxy II. The Scene showing baby Groot dancing. The camera then pans to a shadow reflected on the opposite wall from the store showing a shadow dancing around like Groot on the screen.
Then the camera slowly pans to a couple walking down the street and they seem to notice the shadow and the couple screams.
The camera then pans showing an Algae creature dancing around in front of the TV. Though when the couple screams it turns and screams too glowing yellow.