#1 - Destroyer 8.55
Season 5 - Episode 13
Faced with a common enemy, Lex Luthor and his criminals offer the League to join.
#2 - Divided We Fall 8.47
Season 4 - Episode 12
When most of the Justice League is incapacitated, the League's deadliest enemies emerge to take advantage of the chaos.
#3 - Starcrossed (3) 8.45
Season 2 - Episode 26
The League defeats the squad of hawkmen sent to kill them at the Batcave, but must now figure out how to stop the activation of the hypergate before it destroys Earth.
#4 - Panic in the Sky 8.36
Season 4 - Episode 11
When the founding members are taken out of action, the remaining League members fight to survive Cadmus' ultimate attack on the team.
#5 - Flashpoint 8.35
Season 4 - Episode 10
After an unexpected battle, Superman considers declaring war on Cadmus.
#6 - The Doomsday Sanction 8.33
Season 4 - Episode 3
While Batman investigates the Cadmus conspiracy headed by Amanda Waller, Superman battles a resurrected Doomsday in the heart of a volcano.
#7 - Starcrossed (2) 8.32
Season 2 - Episode 25
The League manage to escape and take refuge at Wayne Manor, while the Thanagarians scout the planet for them and realize their master plan for Earth.
#8 - The Great Brain Robbery 8.32
Season 5 - Episode 8
A mystic artifact causes Lex Luthor and the Flash to switch bodies.
#9 - Question Authority 8.32
Season 4 - Episode 9
While investigating Cadmus, the Question discovers a secret that threatens to shake the very foundations of the Justice League.
#10 - Epilogue 8.30
Season 4 - Episode 13
Sixty-five years in the future, the history of the Justice League is the key to Batman's darkest secret...and his final destiny.
#11 - Hereafter (1) 8.24
Season 2 - Episode 19
After Superman makes the ultimate sacrifice to save his fellow heroes, the Justice League and rest of the grieving planet must learn to live in a world without Superman.
#12 - Wild Cards (2) 8.23
Season 2 - Episode 22
The League manage to defuse the Joker's bombs and defeat the four active members of the Royal Flush Gang...but the Joker has an Ace in the hole as he executes his real master plan.
#13 - A Better World (1) 8.21
Season 2 - Episode 11
The Justice Lords, an alternate version of the League from a different dimension, capture their counterparts and plan to bring their own brand of justice to the new Earth.
#14 - Alive! 8.20
Season 5 - Episode 12
The Justice League take on their opposite numbers in the Legion of Doom in a final battle revealing the Legion's secret sponsor and the mystery behind their ultimate plans.
#15 - Patriot Act 8.20
Season 5 - Episode 7
Green Arrow must lead a team of non-powered superheroes against a berserk super-soldier attacking Metropolis.
#16 - The Terror Beyond (2) 8.19
Season 2 - Episode 16
With the initial ritual destroyed, the League, Fate, and Grundy must travel into the dimension of the Old Ones while Aquaman fights the invaders in the Earth realm.
#17 - Clash 8.18
Season 4 - Episode 7
Captain Marvel, the World's Mightiest Mortal, joins the Justice League as Lex Luthor initiates a new plot.
#18 - Wake the Dead 8.18
Season 3 - Episode 11
Solomon Grundy rises from the grave as a mindless berserker, and when the Justice League can't stop him, they turn to a reluctant Hawkgirl for assistance.
#19 - For the Man Who Has Everything 8.18
Season 3 - Episode 2
Batman and Wonder Woman deliver presents to Superman at the Fortress of Solitude for his birthday, but find he's been immobilized by a special "gift" courtesy of the world-conquering Mongul.
#20 - Flash and Substance 8.17
Season 5 - Episode 5
The Flash must handle an onslaught of super-villains during the opening of a museum in his honor.
#21 - The Once and Future Thing: Weird Western Tales (1) 8.17
Season 3 - Episode 12
Batman, Wonder Woman, and Green Lantern chase a time-traveling thief into the past and team up with some local ""superheroes"" of the era to deal with an outlaw who has used the thief's futuristic technology to take over an Old West town.
#22 - Secret Society (2) 8.15
Season 2 - Episode 18
The Secret Society take advantage of the League's break-up to bring them down until only Green Lantern remains to free his comrades. When he falls as well everything looks hopeless.
#23 - Double Date 8.11
Season 4 - Episode 6
Green Arrow and Black Canary must stop the Question and the Huntress from killing organized crime lord Steven Mandragora.
#24 - The Once and Future Thing: Time, Warped (2) 8.11
Season 3 - Episode 13
In pursuit of a time-traveling thief, Batman, Green Lantern, and Wonder Woman arrive in a futuristic Gotham City twisted horribly awry by alterations to the time-stream, and must join forces with the future Batman and the Justice League Unlimited.
#25 - The Balance 8.10
Season 4 - Episode 5
When Felix Faust escapes the magical mirror in which he was imprisoned by Tala, Wonder Woman and Hawkgirl must go to Tartarus where Faust has overthrown Lord Hades and claimed the place as his own.