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After helping the League of Freedom save the world, Dr. Devizo and his team of villains move into the Mansion as bona fide heroes. The team struggles with their new roommates as Robobot travels across the country in search of the elusive Swine Kampf.

Lex starts a romance with the rogue vigilante Max Penalizer, so Titanium Rex teams with Dr. Devizo on a mission to break the couple apart.

Claudette, Cooch's former owner, returns with a lawyer seeking to get her cat back, so Robobot agrees to represent Rex in the upcoming trial; the Groaner tries to discern the true meaning behind Black Saturn's name.

When the supervillains move out of the mansion and steal half the furniture, the League takes a trip to Swedish furniture store ILEGA; feeling stung by the Groaner's absence, Saturn finds a rebound nemesis in Bugula.

The team heads to Hawaii where Titanium Rex runs into a vacationing former President Barack Obama, Black Saturn and Lex teach Cooch how to swim, and American Ranger attempts to perform in a USO show while an evil threat brews under the sea.

Under an evil spell, The League of Freedom is transported to an apocalyptic future where American Ranger rules the U.S. under a dictatorship. While the heroes confront the horrors that await them in this future, they must help Robobot and Future Robobot fix the time machine needed to return home.

The League of Freedom returns to their home timeline only to discover they've been replaced by the new "League of Freedom West." When Titanium Rex sees that the new squad includes an improved clone of himself, his insecurities get the best of him and his villainous proclivities emerge.

When rival gangs of werewolves and vampires get caught in an eternal war that only Black Saturn can end, Courtney is inadvertently transformed into a vampire. Rex and Ranger are determined to steer Black Saturn away from the dark arts while Robobot steers Lex toward a mindful meditation practice.

Desperate for a comeback, Titanium Rex books an appearance for the team at a comic convention. In one of several humiliating experiences, he bumps into an old '90s version of The League, obsessed with pogs, roller blades and earning Rex’s approval. Meanwhile, Lex is lured on a date.

The League of Freedom is enlisted for a top-secret mission on a perilous jungle island. Despite Cooch going feral and American Ranger succumbing to jungle paranoia, The League successfully identifies the island's supervillain. Elsewhere, Black Saturn desperately tries to prove himself a team leader.

An old, powerful foe from Dr. Devizo’s past returns to haunt him… and aims to kill him swiftly afterward. Both The League of Freedom and The League of Freedom West risk their lives keeping him alive while Lex struggles with an internal conflict over her genetic makeup.

The annual Thanksgiving turkey competition between Titanium Rex and Dr. Devizo goes awry when Rex’s turkey transforms into the bird from hell. Lex struggles to earn a seat at the grown-ups' table while Black Saturn brings The Groaner to his family’s mansion for a traditional Wheelihan Thanksgiving.

When a Russian Super Soldier frozen in time thaws out and publicly challenges American Ranger to a boxing match, Ranger must confront his fears of letting down America.

Coming off the popularity of their boxing commentary, Cooch and Liplor get their big break appearing on a hit children's RV show. Robobot clumsily hides from Titanium Rex a secret...

Cooch and Liplor ride the success of their TV show while Saturn and Ranger join the crew. Titanium Rex and Dr. Devizo have unfinished business on an island where Sgt. Agony has identified a mysterious supervillian, whose powers combine with a tropical storm to render Devizo and Rex vulnerable.

The insect traits Lex inherited from her mother, the evil Frau Mantiss, begin to take over her body, posing a threat to Storm City. Despite Rex's objections, Sgt. Agony orders both Leagues to bring Lex in, dead or alive. Robobot flees the city with a fugitive Lex to help her conquer her affliction.

Fearing that Lex's insectine influences have made The League a threat, Sgt. Agony imprisons the heroes beneath the mansion. As yet uncaptured, Black Saturn assembles a team to bust his roommates from their confinement. Lex remains on the run, fighting to contain her terrifying insect nature.

In the Season 3 finale, Lex's insect half takes over completely, attacking League members and converting them to accomplices. The remaining heroes track Lex to a National Park, where she plans to start a conflagration that will destroy the entire planet.