42. Cripples, Bastards, And Broken Things (Season 1, Episode 4)
Season 1 as a whole is almost flawless, and set the tone nicely for the series, but the fourth episode drops down the list by virtue of the complete lack of any actual action. Everybody is still en route to their destinations for the season. Tyrion is coming back from the Wall, King Robert and Ned are just arriving at Kings Landing, and Dany and Khal Drogo are still traveling. It sets the future episodes up nicely, but if any episode in Season 1 is skippable, this would be it.