This weeks episodes are 3 "Mother" and 5 "Automail! Dash"

Episode 3 is the full story of what happened to Ed and Al and episode 5 is the start of their journey and the introduction of Maes Hughes, Riza Hawkeye and *squees* Roy Mustang! 

The first one is all of episode 3 and the other 3 boxes are parts 1-3 of episode 5.