Jeanine Mason's first guest-starring gig involved playing Muffy the Vampire Slayer (heh) during the Nickelodeon comedy "Big Time Rush's" Season 2 Halloween episode..

“In the audition, they asked me to be physical,” Mason says. “I was like, ‘Oh hell yeah, I’m going to do a fan kick and I’m going to throw out some dance moves.’ The casting director, who’s now a dear friend of mine, was like, ‘Who the hell are you? That was so badass.’ So my epic fan kick got me my first acting gig.”

http://tvline.com/gallery/jeanine-mason-greys-anatomy-so-you-think-you-can-dance-photos/#!2/jeanine-mason-memset-big-time-rush/