India, Nov. 27 -- spoilers ahead!

The first episode of Stranger Things Season 5 Vol. 1 introduces a new character, Mr. Whatsit, who will now surely become a household name. Whatsit is Holly Wheeler's imaginary friend.

Holly (Nell Fisher) believes that Whatsit is very real, despite what her teacher and mother, Karen (Cara Buono), believe, and if you read Madeleine L'Engle's A Wrinkle in Time, you would know it's real too.

In the first scene that isn't a flashback of Stranger Things 5, viewers see Holly waving to someone outside the window while setting the table. That is the first time we "meet" Whatsit.

Later, we see Holly speaking with someone (Mr. Whatsit) at the fence, but when the teacher arrives, no one is there.

After a demogor...