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Dr. Klein is a scientist who works for S.T.A.R. Labs and appeared semi-regularly on the third and fourth seasons of Lois and Clark: The New Adventures of Superman.
Dr. Klein functioned as the resident scientific advisor on the series (similar to Emil Hamilton and other characters). He performed tests and provided expertise to Lois Lane and Clark Kent in their investigations, but he also helped Superman deal with various threats, notably Kryptonite.
In his debut appearance in "Don't Tug on Superman's Cape," Dr. Klein explains that he was keeping Kryptonite in a vault for study, in the hopes of developing a vaccine for Superman.