Ep 10. The Phantom Thief

In Fullmetal Alchemist season 1 episode 10, titled "The Phantom Thief," the Elric brothers make their way to Central City in pursuit of a lead on the Philosopher's Stone. Along the way, they encounter a group of soldiers who were sent to capture a notorious thief named Psiren. After learning that Psiren is actually a young girl named Sara, Ed and Al decide to help her evade the authorities.

Sara is a highly skilled thief who intends to steal a valuable item from a military train passing through Central City. She reveals to Ed and Al that she was orphaned at a young age and had to turn to theft in order to survive. Despite her troubled past, Sara maintains a lighthearted demeanor and a love for adventure.

As the three of them travel together, they encounter several obstacles and close calls with the military police. Ed and Al eventually realize that Sara's true motivation for stealing the item from the train is to avenge the death of her father, who was killed in a military experiment involving the Philosopher's Stone.

Meanwhile, Mustang and his team investigate the thefts committed by Psiren and begin to suspect that there might be more to the story. They eventually cross paths with Ed, Al, and Sara and work together to uncover the truth behind the military's experimentation with the Philosopher's Stone.

"The Phantom Thief" is a fast-paced and action-packed episode that explores the themes of justice, revenge, and the consequences of playing with alchemy. It also introduces several memorable characters, including the charismatic thief Sara and the cunning Colonel Mustang. Overall, this episode is a great addition to the series and sets the stage for future plot developments.