- ("Let's Give the Boy a Hand") Doris was seen in a flashback, posing for the family picture that was used as a clue by the The Ice Truck Killer many years later.
- ("Father Knows Best") In a flashback, Doris urged her husband, Harry, to contact Dexter's biological father for a blood transfusion for Dexter.
- ("See-Through") Doris appeared in a flashback, suggesting to Harry that Dexter should be tested by a psychologist.
- ("Are You... ?") In another flashback, Harry demanded that Doris return Debra's new puppy (as he was fearful that Dexter might harm it).