Henry Creel is shown attending Hawkins High in the Stranger Things: The First Shadow prequel because, in the canon as it currently stands, he lived a period of outwardly “normal” life in Hawkins before he was fully taken into Brenner’s control at the lab. The apparent contradiction with him “always” being in the lab comes from the original show implying, but never outright detailing, his full pre‑lab timeline.

The Basic Canon Answer

  • The prequel establishes that when the Creel family moved to Indiana, Henry enrolled at Hawkins High alongside young Joyce, Hopper, Karen, Ted, and others.
  • Before that move, Henry had already been in covert contact with Dr. Brenner, who was working out of a military base in Nevada and experimenting on him using early sensory-deprivation–style methods.
  • After the murders in the Creel house and Victor being blamed, Brenner ultimately gains full access to Henry and brings him under permanent lab control, which is what the TV series focuses on.

Why It Feels Like a Plot Hole

Many fans assumed Henry spent his entire life inside the lab because:

  • In season 4, all of Henry’s backstory is framed around the Creel house incident, his capture, and then his long years as an orderly “001” within the Hawkins Lab system.
  • The official public narrative in‑universe is that Victor killed his family and that Henry died, which makes Henry casually attending a public high school under his real name feel contradictory.

This is why a lot of forum posts and discussions describe it as either a “huge plot hole” or an unresolved timeline issue between the show and the stage prequel.

How The Prequel Tries To Reconcile It

The newer canon (especially coverage of The First Shadow and related explainer articles) basically does this:

  • Step 1 – Nevada phase:
    Henry’s powers begin to manifest near a Nevada base where Brenner is working; Brenner starts experimenting on him in a more covert, unofficial way while Henry is still technically living with his family and going to school.
  • Step 2 – Move to Hawkins:
    The Creels move to Hawkins for a “fresh start,” Henry enrolls at Hawkins High, and this is where he overlaps with Joyce and Hopper as classmates.
  • Step 3 – Creel house massacre:
    Henry uses his powers to kill his mother and sister, tries to kill his father, and collapses from overexertion, leading to Victor being blamed and institutionalized while Henry himself is taken by Brenner.
  • Step 4 – Full-time lab control:
    From this point on, Henry is in Brenner’s hands and is transformed into 001, which matches what the TV series already showed: the older Henry as an orderly in Hawkins Lab for decades until Eleven frees him.

In other words, the high school period is a bridge between “normal kid with emerging powers” and “permanent lab subject,” not an alternate timeline.

Is It Retcon, Plot Hole, Or Just Expansion?

Fans and commentators are pretty split on whether this is elegant expansion or messy retcon:

  • Some argue it is a retcon because the series strongly implied Henry was effectively under Brenner from very early childhood, leaving no obvious room for him to be a semi-normal high schooler in town.
  • Others see it as filling in gaps the show left open, using stage and transmedia storytelling to deepen the mythology and to explain why Henry has such layered ties to Hawkins, Joyce, and Hopper.

From the franchise’s current canon, though, the answer to “how did Henry Creel go to high school if he was in the lab?” is:

He wasn’t always fully in the lab.
He had a period where he lived in Hawkins, attended Hawkins High, and was already being quietly monitored and manipulated by Brenner, before the Creel house killings gave Brenner the chance to take him into full-time lab custody.

TL;DR:
Henry Creel went to Hawkins High during a transitional phase when he was living with the Creels in Hawkins and only partially under Brenner’s influence; the lab years shown in the series come after that high school period, even though the original show made that timeline feel much more compressed.

Information gathered from public forums or data available on the internet and portrayed here.