Papa, is that you?
Warning: This article contains spoiler aboutStranger Thingsseason 4.
Welcome back, Papa.

Matthew Modine as Dr. Brenner in ‘Stranger Things’.Netflix
(Remember, we never actually saw him die in the first season.)
This is apparent from the opening scenes of the new season, which debuted Friday on Netflix.
In it, we first see Dr. Brenner via flashback getting ready for work at the Hawkins National Laboratories.
The date is Sept. 8, 1979, which is several years before the events of the first season.
During a test with Ten, something goes terribly wrong.
Ten sees images of blood smeared all over the facility.
Suddenly there’s lots of screaming.
He asks her repeatedly, “What have you done?!”
as the screen fades to black and takes us right into that great opening synth theme.
Flashbacks aren’t the only place Dr. Brenner shows up, though.
Can El trust him?
“Let us work together again, you and I, daughter and Papa,” he tells her.
He believes she can access them again with the right stimuli.
Maybe he’s not so bad after all?
After two seasons of being mostly non-existent, Dr. Brenner played a surprisingly important role in season 4.