Internet Movie Database (IMDb) app on my iPhone and look them up. I was trying to figure out why the actor who was playing Jafar (yes, from Aladdin; if your haven't seen Once Upon a Time it loves to mash up Disney characters) seemed so familiar. So I looked him up on the IMDb. And found the actor is Oded Fehr. And Oded Fehr is playing the villain, Asim Naseri, a Middle Eastern terrorist, on the new show 24: Legacy, based on the old 24 with Kiefer Sutherland (who is an executive producer on the new show).
So Mr. Fehr has an opportunity to show off his acting chops, playing the evil Jafar in the fantasy show Once Upon a Time and then playing the evil Naseir in the action show 24: Legacy. Yes, both characters are evil, but Jafar is a different kind of evil than Nasier.
But when you DVR the shows and watch them one after the other, it's a bit jarring to have the same actor in both shows that are completely different types of programs.
And, here's how my brain works: both shows deal with time as in once upon a time and 24 hours in a day.