The first season premiered on September 22, 2003, and consisted of 24 episodes. The show introduces us to Charlie Harper (Charlie Sheen), a successful jingle writer, and his brother Alan (Jon Cryer), a chiropractor who moves in with Charlie after his divorce. The season focuses on the brothers' relationship and the introduction of Alan's son, Jake (Angus T. Jones). Notable episodes include "Pilot" (Season 1, Episode 1) and "Father of the 2004 Year" (Season 1, Episode 13).