Episode 28: All Is One, One Is All (2003 series)

Synopsis
The Elric brothers think back to their apprenticeship days, when their teacher Izumi Curtis left them to survive on a deserted island for a month with nothing but a knife and one rule—they could absolutely not use alchemy during that time. In that month they were to find the meaning of the phrase "all is one, one is all."

Trivia

 * During the episode, after finding their camp fire ransacked and their dinner eaten, Al acccuses Ed of having gotten hungry and eating ahead of schedule, pointing to a handprint in the ground as evidence. Ed points out that the hand print is of a right hand and therefor can't belong to him. Ironically, since it was Wrath who left the print, it is in fact Ed's right hand print.