Sources: 
Netflix's highly anticipated Stranger Things Season 5 is set to explore the mysterious past of Eleven, one of the show's central characters.
Over the previous four seasons, viewers learned that Eleven, portrayed by Millie Bobby Brown, is the daughter of Terry Ives and was taken at birth by Dr. Martin Brenner for psychokinetic experiments.
"Eleven is actually Terry Ives's daughter and was taken away at birth by Dr Martin Brenner (Matthew Modine) to experiment on her psychokinetic skills," a key revelation from the series.
Adding depth to Eleven's backstory, the 2019 prequel novel _Suspicious Minds_ by Gwenda Bond reveals that Eleven's father was a man named Andrew, Terry's boyfriend, who died before she was born.
"According to the book _Suspicious Minds_ by Gwenda Bond, Eleven, aka Jane's father, is a man named who was Terry's boyfriend. The novel further informs readers that Andrew was drafted for the Vietnam War before Jane was born and died before she could meet him," the novel states.
The final season will also feature the return of Dr. Brenner, played by Alex Breaux, signaling a deeper dive into Hawkins' shadowy past.
"Several hints from the creators Ross and Matt Duffer have indicated that some part of the past of Hawkins will be explored in the final season, as Alex Breaux from _The First Shadow_ play will join the fifth season as Dr Brenner," sources confirm.
This season promises to unravel more secrets about Eleven's origins and the dark experiments that shaped her, providing fans with long-awaited answers.
Sources: 
Netflix's Stranger Things Season 5 will delve into Eleven's past, featuring the return of Dr. Martin Brenner. The season promises to explore Hawkins' history and Eleven's origins, including her connection to Terry Ives and her father, as hinted by creators Ross and Matt Duffer.