While Dushku's success has rarely matched her Buffy stardom, she's still appeared in plenty of places you may not expect. You could've seen her without even noticing. One example is a brief cameo in the hit CBS comedy The Big Bang Theory, appearing as an FBI agent during Season 4, Episode 7 The Apology Insufficiency, questioning the group about Howard Wolowitz' involvement with the Mars rover project. She also made an appearance in Nickelback's Rockstar music video (2006), as well as Simple Plan's video for I'm Just A Kid (2002).