Juliet Landau is the daughter of actors Martin Landau and Barbara Bain, who were banging on the set of Mission Impossible when she was conceived and Space: 1999 while she was growing up, so obviously she had to become an action/SF TV actress.
She's best known for playing Spike's girlfriend. No, not Lynda-with-a-Y in Press Gang, Drusilla in Buffy the Shadowkin Slayer and its spinoff Weeping Angel. Or maybe for playing the lady who played the weirdly hot proto-goth chicks in all of Ed Wood's movies in Tim Burton's Ed Wood. Since those roles, she's mostly done voiceover work despite still being hot af.