Lynda Van Der Klok appears in both the original Halloween and its remake. She appears in Halloween as one of Laurie Strode's best friends. She is played by P. J. Soles in the original, and by Kristina Klebe in the remake.
In the original film, Lynda is a good-natured but slightly vapid and hedonistic "valley girl" type. Along with her boyfriend Bob Simms, she goes to the Wallace house on Halloween night to meet up with Annie Brackett and Paul as the pair had planned earlier under the pretense of smoking marijuana and having sex. However, she is not aware that Annie has been killed by Michael Myers. She and Bob then proceed to make out on the couch, unaware that Michael is watching them. Going upstairs, Lynda and Bob have sex, before Lynda sends him downstairs to get some beer. However, Michael ambushes Bob, impaling him with a knife. He then disguises himself as Bob in a ghost costume, using a sheet and Bob's glasses. An oblivious Lynda teases him, only to become irritated and calls Laurie on the phone to see if she knows where Annie or Paul are. Michael walks to Lynda while she is still on the phone, and just as Laurie answers, Michael grabs the phone cord and wraps it around Lynda's neck, strangling her. Laurie can hear Lynda squealing for help, but thinks that Annie is making a prank call. Lynda falls to the floor and dies, and her body is later discovered by Laurie, along with the bodies of Annie and Bob.
In the remake, Lynda, an ex-cheerleader, is a wild, foul-mouthed girl. She is best friends with Laurie and Annie. She has an outgoing, confident personality while also appearing very egotistical and opportunistic. On Halloween night, she and her boyfriend Bob sneak into the vacant Myers house for a wild night of sex, unaware that Michael is on the balcony watching them. After they have sex, Bob goes outside to his van to get more beer. He comes back inside dressed up as a ghost to surprise Lynda, but is ambushed by Michael, pushed up against the wall and stabbed. Lynda, who has not heard the attack because of the loud music she is playing, picks up her cell phone and decides to call Laurie. After Lynda finishes speaking to Laurie, Michael enters the room disguised in Bob's ghost costume and Lynda asks for her beer, but he ignores her. Lynda keeps asking him and he eventually holds his hand out to her. She is annoyed and gets up fully nude, grabbing the beer from him and berating him with profanities, adding that he (the supposed Bob) is bad in bed. Michael then takes off the ghost costume and begins to walk towards Lynda, who has her back to him and does not see him coming. He quickly grabs hold of her neck, choking her until she is dead. He then carries her away. Later that night, Laurie discovers Lynda's naked corpse set up in front of Deborah Myers' headstone and a jack-o'-lantern. She tries to help her and wake her up, before realizing she is dead.
In Rob Zombie's Halloween II, Lynda is the subject of a lewd conversation between a pair of EMTs who are transporting Michael's body in an ambulance, and a photograph of her is shown later when her father Kyle blamed Dr. Loomis for her death. He pulled a gun on Loomis with the intent of killing him. Security guards quickly apprehended and disarmed Kyle, pulling the man out of the store. It was later learned that the gun wasn't loaded.