Almost every episode of Scrubs, medical intern John “J.D.” Dorian is the narrator, infusing his humor, wit and internal insights based on the situations happening around him. There have, however, been times when he passed the voice-over torch, offering a glimpse into the minds of other characters from the series. While J.D.'s perspective dominates the show through his colorful narration, several episodes shift the focus to other characters. Known as "His Story," "Her Story," and "Their Story," these episodes provide introspective narration from someone besides J.D., along with plot lines centered around the experiences of that character.
https://screenrant.com/scrubs-characters-narrated-episodes-j-d-compared/