- Harleeeey! Harleeeey! Come out, come out! Daddy can't kill you if daddy can't find you...
- — Joker
Appearing in "Mightier than the Sword"
- Alfred Pennyworth
- Mr. Columbine
- Summer Gleeson (On a TV or computer screen)
- Bruce Wayne (Cameo) (On a TV or computer screen)
- Barbara Gordon (Cameo) (On a TV or computer screen)
- Mad Hatter (Cameo)
- Two-Face (Cameo)
- Ventriloquist & Scarface (Cameo)
- Comissioner Gordon (Mentioned only)
- Salman Rushdie
- Owlman (Mentioned only) (Fictional character)
- Gotham City
- Paris (Mentioned only)
- Tibet (Mentioned only)
- Mexico (Mentioned only)
Synopsis for "Mightier than the Sword"
Summer Gleeson reports the latest news on TV, such as gossip about Bruce Wayne and Barbara Gordon possibly being in a relationship. Harley Quinn has been released from Arkham Asylum after being declared legally sane, is writing a biography about Joker, Batman, and Robin.
When Joker hears this in Arkham, he vows to murder Harley for turning their relationship into a "cheap, tawdry entertainment for the masses". He talks Poison Ivy into escaping, so she plants a giant beanstalk, but decides not to let Joker go and hurt Harley. However, Joker has other plans, as he punches Ivy and escapes.
In a hotel, Mr. Columbine checks Harley into a room for the purpose of keeping her safe, and tells her to work on her book. She imagines the success and popularity of her new life, while the Joker finds Mr. Columbine and threatens him into telling Harley's location.
Back at Harley's room, Nightwing and Robin arrive to protect her, but she gets angry and climbs up to the roof. There, she meets the Joker, who sprays Robin with his Joker Venom, but when he turns around Harley is gone.
Nightwing injects Robin with an antidote, while Harley waits for an hour in hiding before returning to her room. However, the Joker is still there and screams at her for writing a romance novel about her and "Owlman", who he assumes is Batman. As Joker prepares to kill Harley, he suddenly becomes itchy from Poison Ivy's beanstalk. Harley takes this advantage and beats Joker for kicking her out of the gang one time, almost dropping a bomb on her, and for never truly loving her. Before she can hit him again, Nightwing detains Joker, leaving Harley sad and hurting, until she sees a picture of her and Joker with a note reading "Harley Baby- Love you forever".
- One of Harley's books, titled "I'm Okay You're Okay He's Kind of Weird", is a reference to the book I'm OK – You're OK.
- Harley references Harlequin romance novels.
- Joker alludes to the American novelist, Gertrude Stein.
- Discuss Batman: Gotham Adventures Vol 1 10 on the forums
- Cover gallery for the Batman: Gotham Adventures series
- DC Animated Universe Recommended Reading
- Adventures in the DC Universe (Volume 1)
- The Batgirl Adventures #1
- Batman Adventures (Volume 1)
- Batman Adventures (Volume 2)
- The Batman Adventures: The Lost Years (Volume 1)
- The Batman Adventures: Mad Love
- The Batman and Robin Adventures (Volume 1)
- Batman and Superman Adventures: World's Finest
- Batman Beyond (Volume 1)
- Batman Beyond (Volume 2)
- Batman Beyond (Volume 4)
- Batman Beyond Unlimited (Volume 1)
- Batman Beyond Universe (Volume 1)
- Batman: Gotham Adventures (Volume 1)
- Batman: Harley and Ivy (Volume 1)
- Batman: Mask of the Phantasm - The Animated Movie #1
- Gotham Girls (Volume 1)
- Justice League Adventures (Volume 1)
- Justice League Unlimited (Volume 1)
- Superman Adventures (Volume 1)
- Superman & Batman Magazine (Volume 1)