Warning: This article includes SPOILERS for The Simpsons season 36, episode 13, titled “The Last Man Expanding.”
The long-running series The Simpsons has offered glimpses into Ralph Wiggum’s mysterious parentage in the past, but season 36, episode 13 pushes a popular dark fan theory toward confirmation. Given that The Simpsons is recognized as the longest-running scripted primetime show in American television history, with an astonishing 780+ episodes, it’s not surprising that fans continually speculate about its diverse cast of characters. From Ned Flanders to Principal Skinner and Milhouse Van Houten, the series’ rich universe has inspired countless theories.
However, the enduring nature of the series contributes to certain complications regarding its continuity. While The Simpsons has cleverly set up jokes and payoffs across multiple seasons, it has also been known to contradict significant elements within its narrative framework. Simple details, such as Homer’s birthdate, have changed intermittently throughout episodes. Showrunner Matt Selman touched on this shifting consistency in a recent post on X (formerly Twitter), emphasizing what he calls the “Elastic canon,”which allows for flexible storytelling that can vary from one episode to another.
New Theories Emerge: Eddie as Ralph Wiggum’s Father
Suspicious Glances: Wiggum and Eddie’s Connection

In “The Last Man Expanding,” Chief Wiggum’s experience with a parody weight-loss drug significantly contributes to the episode’s humor while subtly addressing fan theories. After using the drug, Wiggum exuberantly shares how it has transformed his life, even suggesting that his wife Sarah might conceive again. He also comments on the striking resemblance between his son Ralph and his subordinate, Lou. The latter’s alarmed reaction pairs with a close-up of his panicked visage, reinforcing an enduring fan theory that hints Lou might not be Ralph’s only paternal link.
While the notion that Lou is Ralph’s father has enjoyed a long history among fans due to their physical similarities, it is essential to note that this theory remains speculative. Although Eddie’s shocked glance could suggest an underlying truth, it does not necessarily confirm anything definitive about Ralph’s lineage. Chief Wiggum’s history of abusing his authority also casts a shadow on the interactions, raising questions about Eddie’s unease regarding Wiggum’s suspicions about Ralph’s origins.
Non-Canon Confirmations: A Complicated Legacy
A Prior Admission: Eddie’s Role as Ralph’s Father

Previously, in season 34’s “Lisa the Boy Scout,” The Simpsons depicted Eddie as Ralph’s father. However, it’s crucial to highlight that this portrayal was non-canonical. In this episode, Wiggum confronts Sarah in anger over Eddie’s supposed role, but the context was a parody of melodramatic television and therefore not an established point within the series. Similar to Milhouse’s brief departure from Springfield, the implications were swiftly brushed aside, maintaining the question of Ralph’s true parentage as a narrative enigma.
Implications of Eddie as Ralph’s Possible Father
Exploring the Depth of Season 36 Episode 13’s Revelation

Despite the surface-level implications of Eddie potentially being Ralph’s father, in personality, Ralph aligns closely with Chief Wiggum. This revelation would complicate Ralph’s character arc and the distinctive dynamic he shares with his father, given the simplistic yet endearing nature that has come to define him. Traditionally, Ralph’s innocent naiveté stands in stark contrast to Chief Wiggum’s misplaced authority and cluelessness.
In a current season where Bart’s screen time has diminished, delving into Ralph’s parentage seems an odd and unnecessary narrative choice. The simplicity of Ralph’s character is part of what makes him lovable, and any drastic shifts in his backstory could undermine that charm by exposing more complexity than the show typically employs. A revelation regarding the true identity of Ralph’s father should be treated cautiously, as it has ramifications that could alter the essence of these beloved characters.
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