Madeleine Spencer (Cybill Shepherd) is Shawn's mother and Henry's ex-wife. After the ordeal, she shares a brief kiss with Henry. Abigail Lytar (Rachael Leigh Cook) is Shawn's ex-girlfriend. She first appeared in "Gus's Dad May Have Killed an Old Guy" (2.10) followed by "Christmas Joy" (3.09) and in "A Nightmare on State Street" (8.09).She has an eidetic memory, which she passed on to her son. She first appeared in "Gus's Dad May Have Killed an Old Guy" (2.10), in which Shawn and Henry visit the Gusters for Christmas.She explains to Shawn that she left his father in 1992 to pursue a job opportunity, a surprise to Shawn, who had always believed Henry left her. Guster had been having an ongoing feud with the deceased.
The character makes light of the rotating actors in the role when Tony Cox comments that Shawn and his younger self look nothing alike.
Young Shawn (portrayed by Skyler Gisondo) replies, "Well, we changed!
Shawn soon points out that she was cheating on him with her personal trainer, and Woody responds that he had approved. After Yin ties her to the bottom of the pier (where Shawn stood her up in high school), Shawn is issued an ultimatum: rescue Juliet or rescue Abigail.
When Shawn points out other men in her life, Woody states that he hadn't approved those particular men. He chooses Abigail, and barely succeeds in saving her life.
They blame him for being a negative influence on Gus. It is made known that she had used a bookie to place one bet, and had lost most of her savings.
However, he solves the murder, revealing that it was not in any way connected to them. However, her family forgives her, and she forgives her family for all the mistakes that they had made as well.
The character always appears in flashbacks to the late 80s or early 90s. Together, they solve the murder of one of their former classmates. Yang" (3.16), Gus accuses Shawn of not being able to keep a steady relationship.
Young Gus first appeared in "Spellingg Bee" (1.02) and has appeared in many episodes since. He then proceeds to call Abigail, immediately asking her on a date.
Young Gus (portrayed by Carlos Mc Cullers II in the majority of appearances) is the younger version of Gus.