Die Serie beginnt mit der Erweiterung der Justice League und der Aufnahme neuer Mitgliedschaft, welche im Verlauf der Serie auch ihre eigenen Geschichten haben, darunter Supergirl, Green Arrow und Black Canary, Huntress, Vixen, Vigilante und der Shining Knight, Stargirl und ihr Vater S.T.R.I.P.E., Booster Gold, und Fire und Ice.
Die Liga der Gerechten (Staffel 1)

Initiation (Folge 1) 6.6
Autor: Stan Berkowitz
Sendedatum: 2004-07-31
Laufzeit: 23 min
Übersicht: After unsuccessfully attempting to recruit the Green Arrow to join the expanded League, he plays an important role with a team sent to manage a crisis in Asia.

For the Man Who Has Everything (Folge 2) 7.5
Autor: J. M. DeMatteis
Sendedatum: 2004-08-07
Laufzeit: 23 min
Übersicht: Batman and Wonder Woman find Superman immobilized in the Fortress of Solitude by a plant sent by the would-be conqueror Mongul.

Kid Stuff (Folge 3) 7.4
Autor: Henry Gilroy
Sendedatum: 2004-08-14
Laufzeit: 23 min
Übersicht: Morgaine Le Fey transforms Superman, Batman, Wonder Woman, and Green Lantern into children after Mordred uses his magic to remove all adults from Earth and keep children on the Earth.

Hawk and Dove (Folge 4) 7.0
Sendedatum: 2004-08-21
Laufzeit: 23 min
Übersicht: Ares creates a war machine called the Annihilator to escalate a civil war in Kasnia. Hawk, Dove, and Wonder Woman try to stop his plans.

This Little Piggy (Folge 5) 6.6
Autor: Paul Dini
Sendedatum: 2004-08-28
Laufzeit: 23 min
Übersicht: When Circe changes Wonder Woman into a pig, Batman and Zatanna must find her and change her back.

Fearful Symmetry (Folge 6) 6.8
Sendedatum: 2004-09-04
Laufzeit: 23 min
Übersicht: Supergirl, Green Arrow, and The Question investigate Supergirl's disturbing dreams. They discover that Cadmus created a clone of Supergirl named Galatea while she was recovering from her fight against Superman on Earth.

The Greatest Story Never Told (Folge 7) 6.6
Autor: Andrew Kreisberg
Sendedatum: 2004-09-11
Laufzeit: 23 min
Übersicht: The Justice League battle Mordru in the background, while the narrative follows Booster Gold as he attempts to close a walking black hole while he's supposed to be on "crowd control".

The Return (Folge 8) 7.1
Sendedatum: 2004-09-18
Laufzeit: 23 min
Übersicht: After blasting through the entire Green Lantern Corps, the android Amazo returns to Earth. Only the Justice League stands between him and his goal -- the now-reformed Lex Luthor.

Ultimatum (Folge 9) 6.8
Sendedatum: 2004-12-04
Laufzeit: 23 min
Übersicht: A team of too-good-to-be-true superheroes find out the truth about their origins and go on the rampage.

Dark Heart (Folge 10) 6.6
Autor: Warren Ellis
Sendedatum: 2004-12-11
Laufzeit: 23 min
Übersicht: Most of the League battles with powerful alien nanotechnology but, realize that the waves of self-replicating robots cannot be simply destroyed. The diminutive Atom shrinks himself to stop the robots from the inside.

Wake the Dead (Folge 11) 7.8
Sendedatum: 2004-12-18
Laufzeit: 23 min
Übersicht: A trio of high school kids accidentally resurrect Solomon Grundy, reviving him more powerful than ever but with no memories of his past. Dr. Fate, Amazo, Aquaman, and Shayera assist League regulars stopping his rampage.

The Once and Future Thing (1): Weird Western Tales (Folge 12) 7.2
Autor: Dwayne McDuffie
Sendedatum: 2005-01-01
Laufzeit: 23 min
Übersicht: While pursuing a time traveling thief, Batman, Wonder Woman and Green Lantern team up with a collection of DC Universe western heroes to battle the villain controlling him.

The Once and Future Thing (2): Time, Warped (Folge 13) 7.7
Autor: Dwayne McDuffie
Sendedatum: 2005-01-29
Laufzeit: 23 min
Übersicht: The time traveling League team goes to the future to team up with that time's League to battle Chronos who rules.
