Season 5: Episode 107: Flame Resistant

Doug and Carrie run into Doug's high school girlfriend, Margie, at his favorite sports bar. Carrie gets jealous when she discovers that Doug's mother would rather spend time with his ex-girlfriend than her. Margie and Doug fight over the song that Doug was meant to write for her back in high school. Doug, intent on redeeming himself attempts to write the song with help from Danny.