<Li> Joe Davison as a technician at Hawkins Laboratory . </Li> <Li> Priah Ferguson as Erica Sinclair, Lucas' younger sister . </Li> <Ul> <Li> Ross Partridge as Lonnie Byers, the drunk, egotistical, selfish ex-husband of Joyce Byers and father of Jonathan and Will . He has a much younger girlfriend named Cynthia . </Li> <Li> Chris Sullivan as Benny Hammond, owner and chef of Benny's Burgers, and friend of Hopper . </Li> <Li> Andrew Benator as a scientist at Hawkins Laboratory . </Li> <Li> Glennellen Anderson as Nicole, a classmate of Nancy, Steve and Jonathan . </Li> <Li> Pete Burris as the head of security at Hawkins Laboratory . </Li> <Li> Jerri Tubbs as Diane Hopper, Jim's ex-wife . </Li> <Li> Amy Seimetz as Becky Ives, Terry's sister who takes care of her . </Li> <Li> Elle Graham as Sarah Hopper, Jim and Diane's daughter . </Li> </Ul> <Li> Ross Partridge as Lonnie Byers, the drunk, egotistical, selfish ex-husband of Joyce Byers and father of Jonathan and Will . He has a much younger girlfriend named Cynthia . </Li>

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