Justice League Action Wikia
Justice League Action Wikia

"Best Day Ever" is the thirty-third episode of Justice League Action.


The Joker springs Lex Luthor from prison using a 'Mother Box' but only to take him on apparent holiday excursions, and the pursuing Justice League are unable to determine his real intention.


Batman Kevin Conroy
Superman Jason J. Lewis
Wonder Woman Rachel Kimsey
Flash Charlie Schlatter
Cameos by Zatanna, Cyborg, Green Arrow, Hawkman -
Joker Mark Hamill
Lex Luthor James Woods


The Flash is making his nightly visit to a high-security prison and runs around at super-speed checking the prisoners' cells. As he talks to one of the guards, the Joker (dressed as though he's been on holiday in Hawaii) suddenly appears out of thin air and greets Flash before disappearing again through a travel portal. Flash instructs the guard to lock down the prison. Elsewhere, Lex Luthor is in his cell - complaining innocently that he had only built a bomb of ultimate destruction and had not used it - when Joker appears and disposes of the guard. He enters the cell using a travel portal, and Luthor can see that he is holding a 'Mother Box.' Joker tells him that he has obtained it from Desaad (one of Darkseid's Elite from Apokolips) and, as Flash appears, he vanishes taking Luthor with him.

They re-materialise knee deep in water near a beach and Joker tells Luthor that he intends to treat him to the best day ever to allow him to get over his debacle with his bomb. Luthor does not believe him but cannot get a straight answer. Joker warns him against going ashore and, when he does, is confronted by an irate Wonder Woman with sword and shield - they are on Paradise Island. Joker grabs him before the superheroine can apprehend him and they disappear, travelling to a theme park with a high water slide.

In the Watchtower, the Justice League (Batman, Superman, Wonder Woman and Flash) observe them remotely but only see them harmlessly enjoying themselves. Batman is determined to discover Joker's true motives and zooms in to his to-do list to see the next stop as the North Pole. The League move to the Fortress of Solitude but only find it daubed with graffiti, as Krypto the Superdog has chased off the villainous pair. Returning to the Watchtower, they find that Joker has been there too, but this time Ace the Bat-Hound has seen him off. Batman warns other League members to be vigilant, so when Joker, less the seat of his pants, visits a casino, Zatanna is there but can't detain him. At a racing car circuit, Cyborg has no better luck, and Green Arrow's arrows can't stop him at an art gallery. Only at the Pyramids, where Joker uses the Mother Box to shoot at Hawkman, does he ask Luthor where he wants to go.

The latter decides to seek refuge in his secret hideout but when there, as he tells Joker about the hidden bomb of ultimate destruction, he hears the Mother Box charge up as though to shoot him and realises what the Joker's plan is. The latter instructs him to reveal the bomb and then starts the countdown. Luthor now sees that the many locations visited have attracted many superheroes in pursuit so that they will be destroyed in the blast. Duly, all the previously mentioned heroes now arrive and a battle begins and yet they are unable to get the better of Joker and his Mother Box and begin to fall. Luthor dons his battle suit and takes out the rest but, as the countdown ticks down, he changes his mind. Tricking the Joker, he knocks him out and stops the bomb.

Luthor is returned to prison where he expects to get some peace and quiet but finds that he now has a cellmate: the Joker.

Video Excerpts


Justice League Action - Joker's Big Day Out - DC Kids


Justice League Action - Last Day Ever - DC Kids


  • Big Belly Burger, the fast food joint Joker stops at, is a chain of fast food restaurants made famous in the Arrow Multiverse.
  • Joker vandalizing the paintings in a museum is a reference from the 1989 "Batman" movie.