Now this part of my website is for all the Supernatural fans out there who love Sam and Dean. This page is all about comparing the two brothers on how they act throughout the seasons. So lets start with season one. I always thought that Sam and Dean have had this Yin Yang quality to them. Always thought that Dean was the cold hearted shoot first ask questions later kind of guy. Then you have Sam who balanced Dean with his kindness and his logical reasoning. I feel however as the show went on slowly a shift started to occur. Their dad died and Dean sort of shut down and hold his rage in. Then Sam died and Dean made a deal with a demon to bring him back. while this was all happening they were both acting normal, then Dean died. Sam when dark side and started drinking demon blood. This made him blind to his decisions and irrational. He did things that he would never have done before because of Deans death, the first bad decision drinking demon blood. The blood made him even worse. Then Dean gets resurrected and they have switched places. I think finally things go back to normal mid way through season five after Sam brought the devil to earth and Sam and Dean made up and started working again. Now I wont go any further because sadly I'm not up to date in the series.