'Stranger Things': Sean Astin, Paul Reiser Among Trio Cast in Season 2

Linnea Berthelsen, Sean Astin and Paul Reiser Split-H 2016
Courtesy of Netflix; Albert L. Ortega/Getty Images; Courtesy of Netflix

Netflix is adding some big names to the cast of Stranger Things season two.

Joining the streaming giant's summer sensation are Sean Astin, Paul Reiser and Danish star Linnea Berthelsen, The Hollywood Reporter has learned.

Astin will play Bob Newby, a kind-hearted former nerd who went to high school with Joyce (Winona Ryder) and Hopper (David Harbour) and now manages the local Hawkins RadioShack.

Reiser will play Dr. Owens, a high-ranking member within the Department of Energy on a "clean-up" assignment who is tasked with containing the events of last year.

Berthelsen is set as Roman, an emotionally damaged, magnetic young woman who suffered a great loss as a child. Although she does not live in Hawkins, she is mysteriously connected to the supernatural events at the lab.

The trio join newcomers Sadie Sink and Dacre Montgomery in the sophomore season of the 1980s sci-fi drama from brothers Matt and Ross Duffer. They join a cast that includes new series regular Joe Kerry (Steve Harrington) and Noah Schnapp (Will Byers) as well as breakout star Millie Bobby Brown (aka Eleven), Finn Wolfhard (Mike), Gaten Matarazzo (Dustin), Caleb McLaughlin (Lucas), Natalia Dyer (Nancy), Charlie Heaton (Jonathan), Cara Buono (Karen) and Matthew Modine as Martin Brenner.

Details about the second season of the breakout 1980s-set drama remain sketchy, but the roles of Max and Billy are two of the three new faces expected to join the summer hit.

"There's definitely a handful of really compelling new characters this season, but absolutely servicing the core group first and foremost," executive producer Shawn Levy previously told THR. "Like the show itself, it's multigenerational new characters and really, really intriguing ones."

Astin's credits include The Lord of the Rings, The Goonies and Unleashed. On the small screen, his credits include The Strain, 24 and a voice role on the animated series Teenage Mutant Ninja Turtles. He is repped by WME.

Reiser is best known for the '90s sitcom Mad About You and is currently co-starring on Amazon's Red Oaks. He is with Gersh.

Berthelsen grew up in Denmark and appeared on local TV series Exitium and The Desert. She is with Panorama Agency.