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This article contains spoilers for Stranger Things.
The actor, who plays the late Billy Hargrove on the series, filmed his quick season 4 cameo remotely from his Australian hometown due to COVID-19 restrictions. Reflecting on the experience across multiple Instagram posts, Montgomery, 27, said he worked with a local crew and had director Shawn Levy oversee the process over Zoom.
"Feeling extremely fortunate to have been able to shoot these scenes during the pandemic in my hometown, Perth (in Australia)," Montgomery captioned the photos. "What an absolute blessing to work with such an incredible local crew and @slevydirect directing on Zoom! @strangerthingstv."
The featured photos showcase Montgomery's wounded façade for the series, which included a chest full of welts and gashes. He was also pictured wearing a white tank top with a bloody hole near his heart.
Additionally, Montgomery posted a video of himself laughing about the gruesome getup with makeup artists on set.
Montogomery joined Stranger Things in its second season airing in 2017. Season 3 was largely focused on Billy's unintentional turn to evil after the Mind Flayer possessed his physical body.
In the season finale, Billy returned to normal but ultimately died in the Battle at Starcourt Mall.
Montogomery briefly reprised his role for the season 4 episode titled "Dear Billy." Upon doing so, he appeared in one of his stepsister Max Mayfield's (Sadie Sink) nightmares.
Billy's untimely death has continued to haunt Max in season 4 as she battles headaches, nightmares and issues with her overall mental health.
In the fourth episode, Max visited Billy's gravesite to read him a letter. New villain Vecna then attempted to capture her by using Billy's image as a manipulation tactic.
Part one of Stranger Things season 4 is now streaming on Netflix. Additional episodes from the season will be released on July 1. Just two episodes will make up part two, with the finale episode clocking in at roughly two and a half hours.