Season 3 Robin attends Hawkins High School, where she is a member of the marching band playing the
french horn, and is classmates with
Steve Harrington, and
Nancy, though is somewhat of a loner and social outcast. Robin gets a job at Scoops Ahoy ice cream parlor at Starcourt Mall when it opened in 1985. Steve is also forced to get a job there by his father when he fails to get the grades to attend college. Robin has some animosity towards Steve from their school days and would often tease him during their shifts. She overhears
Dustin Henderson tell Steve that he has intercepted a secret Russian radio transmission, and helps them successfully translate it into English. She and Dustin deduce that it is a coded message and discover that it refers to a delivery that is due to be made to the mall that night.
Erica Sinclair helps the trio access a secret elevator that leads them to discover a Russian base underneath the mall filled with containers of mysterious green liquid and a rift leading to an alternate dimension that she later discovers is known by Steve and Dustin's group as the Upside Down. Robin and Steve are captured by the Russians, injected with truth serum, and interrogated. While in custody, Robin reflects on how much she resented Steve for his popularity at school and he tells her that he wishes he'd gotten to know her better back then. They are rescued from the base by Dustin and Erica. While recovering from their ordeal, Steve confesses to Robin that he likes her and that spending time with her has been the most enjoyable part of his summer. Robin tells him that she appreciates him as a friend, and reveals that she was not envious of Steve because she had a crush on him, but because he was able to charm her real crush, a girl named Tammy. Despite his initial confusion, Steve realizes that Robin is gay and accepts her, joking that she is too good for Tammy. The group then attempt to find a way out of the mall, and Robin sees
Eleven save them by telekinetically throwing a car at the Russians. Robin is then present for the battle against the Mind Flayer, a monster from the Upside Down. Once the Mind Flayer is defeated, Robin learns the truth about the Upside Down, Eleven, and the disappearance of
Will Byers. Following the closure of the Starcourt Mall, Robin and Steve get jobs at the town's
Family Video store.
Season 4 Robin begins to become romantically interested in Vickie Dunne, a fellow member of the marching band but, despite Steve's support, is unsure of how to approach the situation, as she did not know whether Vickie reciprocated her feelings. While working, she and Steve see live news footage reporting on the suspected murder of Hawkins High student Chrissy Cunningham, with Dustin and
Max revealing that Dustin's friend
Eddie Munson was the prime suspect. The group find Eddie that night, and he maintains that Chrissy died after he saw her levitating into the air and all of her limbs being magically snapped, and that he believes a dark wizard named
Vecna is responsible. When Nancy's colleague at the school newspaper dies in similar circumstances, Robin and Nancy visit the library and find an article detailing a massacre that took place in 1956 where Victor Creel, the only survivor, reported that a demon was responsible. The pair then go undercover at Pennhurst Asylum to speak to Victor themselves, and reassured him that they believed his story, encouraging him to reveal his family history to them and expressing that he was saved from the massacre through a piece of music that he was connected to. Robin and Nancy are able to share this information with the others who use it to successfully save Max, Vecna's next victim, from being murdered. They go to Victor's old house to look for clues, and deduce that he is using the version of his house in the Upside Down as his base of operations. Robin, Eddie, Nancy, and Steve enter the Upside Down through an underwater gate and fight of swarms of
Demobats and are forced to flee back to the real world through another gate with the aid of Dustin,
Lucas, Erica, and Max. Nancy, having briefly been possessed by Vecna, reveals that he is Victor's son Henry, and they make a plan to defeat him by using Max as bait. While preparing, Robin attempts to talk to Vickie, only to see her boyfriend arrive, causing her to walk away feeling dejected. Robin, Nancy, and Steve return to the Upside Down and successfully locate the Creel mansion and attack Vecna using a shotgun and molotov cocktails, but he escapes and completes his ritual, opening multiple gates to the Upside Down in Hawkins and causing a massive earthquake in Hawkins. While assisting in relief efforts, Vickie tells Robin that she broke up with her boyfriend and the two begin bonding over their shared personality traits.
Season 5 Following the completion of Vecna's ritual, Hawkins becomes quarantined by the military between 1986 and 1987, who seal the gates with steel plates and tell the locals a false story to keep the truth hidden. Robin takes over the WSQK radio station, calling herself "Rockin' Robin", with Steve working as her producer. She uses her broadcasts to transmit coded messages to the rest of the group and co-ordinate "crawls" of the Upside Down in order to search for Vecna and kill him. The group also use the station as their base of operations. Robin, now dating Vickie, frequently visits her at the hospital where she works as a
candy striper. Their relationship is occasionally contentious due to Robin having to lie about her whereabouts so as not to reveal the truth to Vickie. Will accidentally sees the two kissing, and abruptly runs off. When the group discover that Will still has a connection to the
Demogorgon hive mind from his time in the Upside Down as a child, Robin suggests using him as a "human antenna" to locate Vecna, though
Joyce refuses to put him at risk. They trick Joyce so they can sneak out and head to woods where Will had an earlier vision. Robin asks Will if he saw her with Vickie at the hospital, stating that they are just good friends whose relationship may confuse some people. Will assures her he saw nothing and discovers that Vecna is planning to abduct Derek Turnbow. Robin suggests using drugs to knock out the Turnbow family and remove them from their house so they can set a trap to find Vecna. While searching for drugs at the hospital, Will admits he saw Robin kiss Vickie and asks Robin how she knew Vickie would reciprocate, and Robin shares several anecdotes about their relationship and its beginnings. She also subtly reassures Will about his own sexuality after deducing that he is also gay and tells Will about her old feelings for Tammy and her subsequent coming out to Steve. Robin later takes part in the plan to smuggle Vecna's other targets out of Hawkins, and she and
Murray successfully help three children into his truck before they are ambushed by a group of Demogorgons and the children are taken. Will saves Robin's life by psychically killing the Demogorgons, having unlocked a newfound inner strength and self-acceptance as a result of their conversation. After finding out that Max is trapped in Vecna's mindscape, Robin and Lucas head to the hospital, theorizing that she will return to her body once she escapes. When they get there, Robin is confronted by Vickie, who knows she stole drugs and is concerned for her well-being and constant evasiveness. Robin realizes that the military have arrived and is briefly apprehended, but flees with Vickie once Demodogs begin arriving at the hospital, and they are able to warn Lucas to get Max out of her room before the Demodogs can kill her. The four are cornered in the laundry room but are saved by
Karen, who detonates an oxygen tank to kill the Demodogs. Robin expresses support to Will when he comes out as gay to the others, with Steve placing a reassuring hand on her shoulder. Now aware of the truth, Vickie joins the group at the radio station where Steve proposes a plan to rescue the children and end Vecna once and for all. Robin joins the group in entering the Upside Down and climbs into the Abyss, helping the others take down the revived Mind Flayer before watching Joyce kill Vecna. Eighteen months later in the spring of 1989, Robin presents a new radio broadcast, detailing that the military have left Hawkins and that everyone has returned to town for the graduation of Will, Mike, Lucas, Dustin, and Max. Later, Robin meets with Steve, Nancy, and Jonathan on the roof of WSQK, and the group promise to stay connected despite their differing life and career paths. == Development ==