<Li> Phil Hartman - (seasons 1 & 3) playing a camp cosmetics store worker and Randy, Vicki Dubcek's ex-lover </Li> <Li> Jane Lynch - playing Tommy's science teacher, Ms. Koppel </Li> <Li> John Mahoney - playing Leonard Hamlin, a rude, sexist professor </Li> <Li> Lauren Graham - playing Laurie Ives </Li>

Who stars in 3rd rock from the sun