Fullmetal Alchemist: Brotherhood - episode 52 - 10 Apr, 2010

Alphonse begins using the philosopher's stone to battle against Pride and Kimblee. He manages to trap Pride once again, but is taken by surprise by Kimblee when he starts using his own stone. Meanwhile, as the Armstrong siblings start to gain the upper hand over Sloth, it is then that Sloth begins to use his true strength and reveals himself to be the fastest homunculus. Although Alphonse gets apprehended by Pride again, Heinkel, having been healed by Marcoh, manages to deliver a fatal blow to Kimblee. Yoki arrives to rescue Alphonse and the others and head toward Central, while Pride consumes Kimblee. As Armstrong manages to temporarily impale Sloth on a spike, both he and Olivier are attacked by mannequin soldiers. Meanwhile, May fends off both Envy and the mannequin soldiers, while Edward's group, overwhelmed by the mannequin soldiers, are joined by Mustang and Hawkeye. (Source: Wikipedia)