Maybe I'm the only one who didn't realize it when he made his appearance on Once, but the other day I was watching Vegas Vacation (they were doing a Vacation marathon on E!) and was checking imdb to see what else the kids had been in, and acting credits for Ethan Embry (who plays Russ) included Once Upon A Time - as Greg Mendell/Outsider/Stranger. I never realized it until then, but that could just be me, I'm always bad at recognizing actors across different shows/movies. Too bad he didn't say his name was Nick Pappagiorgio, would have been a nice Easter egg.