kate micucci ( ; born march 31, 1980) is an american actress, voice actress, comedian, singer, and songwriter who is half of the musical comedy duo garfunkel and oates. some of her well-known roles include stephanie gooch in "scrubs", shelley in "raising hope", lucy in "the big bang theory", sadie miller in "steven universe", sara murphy in "milo murphy's law", daisy in "nature cat", clayface in "the lego batman movie", velma dinkley in "scooby-doo", webby vanderquack in "ducktales", and dr. fox in "unikitty!".