episode of septimus warren smith

I'm not sure what you mean by "episode" but hopefully this helps,

Often considered Clarissa's doppelganger, Septimus was a successful, intelligent, literary young man before World War I. During the war, he wins many honors and friends. After a good friend, Evans, is killed, he realizes that he can no longer feel. Marrying Rezia in an attempt to move on, Septimus never regains an emotional attachment to the world. The couple moves back to London and Septimus returns to his good job, but he slowly slips into further depths of despair and horror. He hears voices, namely of Evans, and becomes extremely sensitive to color and natural beauty. The doctors compound his problems by ignoring them, and they become the embodiment of evil and humanity, in his mind. When Dr. Holmes pushes into his home to see him, Septimus throws himself out the window to his death.