In which TV series is Michael Scofield a main character?

Who played Sam Winchester in 'Supernatural'? Who played Dean Winchester in 'Supernatural'? In which TV series is Dean Winchester a main character? Who played Michael Scofield in 'Prison Break'? Who played Charlie Kelly in 'It's Always Sunny in Philadelphia'? Who played Dennis Reynolds in 'It's Always Sunny in Philadelphia'? In which TV series is Dennis Reynolds a main character? Who played Frank Reynolds in 'It's Always Sunny in Philadelphia'?