Chapter Two: The Weirdo On Maple Streetstranger... Direct

Eleven lacks basic social understanding; she nearly undresses in front of the boys when given fresh clothes, prompting Mike to explain the concept of "privacy" and the bathroom.

When Lucas threatens to tell Mike’s mother about her, El uses her telekinesis to slam the bedroom door shut, revealing her abilities and suffering a nosebleed from the effort. The D&D Translation Chapter Two: The Weirdo on Maple StreetStranger...

A key moment in the episode involves Eleven using a board to explain what happened to Will. She flips the board over to represent a

She flips the board over to represent a parallel dimension—later known as the Upside Down—and places the "Will the Wise" token on the black underside to show he is hiding. Eleven lacks basic social understanding

Mike officially gives her the nickname "El," shortened from the "011" tattoo on her arm.