The Oath in the Tunnel
Lan Fan and Lin fight Gluttony, and Heinkel continues to fight Pride. Meanwhile, Roy visits Madam Christmas to confirm that Selim Bradley is in fact a homunculus. Pride manages to get back the upper hand in the fight and wounds Heinkel. However, before Pride can finish him off, Ed intervenes and saves Heinkel using his northern automail, now carbon-reinforced. Spies from Central are shown to have followed Roy to Madam Christmas's bar, and as they find out that the madam is Roy's foster mother, the bar is blown up by Roy, who escapes through the sewers with Madam Christmas. Roy then meets up with his subordinates before they attempt to take over Central. Pride takes over Al again, but right before he fights Ed through Al, Fu throws a flash bang into the air, overwhelming the shadows with light and breaking Pride's control of Al. Darius then takes Al away to a safer place, and Gluttony stumbles upon Pride and Ed's fight. Upon discovering that Lan Fan and Lin can sense homunculi, Pride consumes Gluttony, both to replenish his lives as well as to gain a sense of smell that can detect Ed and his group. Pride then smells Hohenheim, who has met up with Darius and Al. Back in Central, Mustang begins his upheaval plot by capturing King Bradley's wife.
Aired 14/03/2010EP 48 - The Oath in the Tunnel
Fullmetal Alchemist: Brotherhood
"In order for something to be obtained, something of equal value must be lost."
Alchemy is bound by this Law of Equivalent Exchange—something the young brothers Edward and Alphonse Elric only realize after attempting human transmutation: the one forbidden act of alchemy. They pay a terrible price for their transgression—Edward loses his left leg, Alphonse his physical body. It is only by the desperate sacrifice of Edward's right arm that he is able to affix Alphonse's soul to a suit of armor. Devastated and alone, it is the hope that they would both eventually return to their original bodies that gives Edward the inspiration to obtain metal limbs called "automail" and become a state alchemist, the Fullmetal Alchemist.
Three years of searching later, the brothers seek the Philosopher's Stone, a mythical relic that allows an alchemist to overcome the Law of Equivalent Exchange. Even with military allies Colonel Roy Mustang, Lieutenant Riza Hawkeye, and Lieutenant Colonel Maes Hughes on their side, the brothers find themselves caught up in a nationwide conspiracy that leads them not only to the true nature of the elusive Philosopher's Stone, but their country's murky history as well. In between finding a serial killer and racing against time, Edward and Alphonse must ask themselves if what they are doing will make them human again... or take away their humanity.
(Source: MAL Rewrite)