The actress who portrayed Max's mom on Stranger Things in seasons 2 and 4, Jennifer Marshall, claims that being invited back for season 5 would've financially aided her cancer battle. Marshall, 44, took to Instagram on Tuesday, January 6, to tell fans that returning as Susan Hargrove in the Netflix series' final instalment would've proved life altering. "I had cancer, I get it. But I was in remission during the shooting of season five. Shooting would have helped me obtain my health insurance through the union.