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“Chemistry”
'The New Batman Adventures' episode
Episode no.	Season 2 Episode 22
Written by	Stan Berkowitz
Directed by	Butch Lukic
Production no.	022
Original airdate	October 24, 1998
Episode chronology
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"Mad Love"	"Beware the Creeper"
List of Batman: The Animated Series episodes

Chemistry is an episode from season four of the animated television series Batman: Gotham Knights. It premiered on October 24, 1998.

Contents 1 Plot 2 Cast 3 Notes 4 Trivia

At Veronica Vreeland's fourth wedding, Bruce Wayne meets and falls for a woman named Susan Maguire. After dating for a few months, Bruce proposes to Susan, and breaks the news to his comrades about giving up the life of being Batman.

A few days later, Bruce and Susan are wed. However, the wedding is interrupted by a call on Bruce's mobile phone for help by Veronica. Bruce leaves an understanding Susan, and arrives at Veronica's flaming house. Bruce manages to find his way through and rescue an unconscious Veronica just as the house explodes. After taking Veronica to the hospital, Bruce is visited by Veronica's husband, Michael, who was apparently absent when the house exploded.

However, Michael, tailed secretly by Robin and Batgirl, pays a visit to Poison Ivy, his employer. Here, it is revealed that Michael is actually a plant-human disguised by human tissue. Poison Ivy then reveals her plan to attack a sea cruise where the rest of her plant henchmen are, which is, ironically, the same cruise Bruce and Susan plan to go on for their honeymoon.

On the cruise, Bruce demands to know more about Susan, and after a brief quarrel over Susan's mysterious discretion, green liquid starts to leak from her head. Infuriated, Susan turns her legs into vines and tries to squeeze Bruce to death, after revealing that she works for Poison Ivy, who is after Bruce's money. Bruce manages to use a nearby lamp to electrocute Susan and escape, using a ladder to trap Susan in the bedroom.

However, just then, Poison Ivy and Michael arrive on a speedboat, and many of the passengers reveal their plant-selves and start robbing their spouses, until the spouses grow angry and fight back. Robin and Batgirl then show up in the Batwing and use some tanks of acid to disintegrate the plant-people, including Michael. Bruce manages to sneak off for a minute and slip into his Batman attire. An enraged Poison Ivy grapples with Batman just as the acid starts a chain reaction, causing the cruiser's machines to explode and sink the cruiser itself. Robin and Batgirl manage to board the speedboat with the innocent passengers, but Batman tells them to leave without him. Eventually, Batman is able to throw Poison Ivy aside just as the cruiser explodes into two parts. Batman uses his grapple gun to hold onto the Batwing, but is unable to grasp Poison Ivy's hand in time. Ivy apparently drowns in the water, and Batman manages to get a glimpse of Susan looking out of the cruiser's window before it completely submerges.

Batman then throws his wedding ring into the ocean.

• Kevin Conroy — Batman / Bruce Wayne
• Loren Lester — Dick Grayson
• Mathew Valencia — Robin / Tim Drake
• Tara Strong — Batgirl / Barbara Gordon
• Diane Pershing — Poison Ivy
• Efrem Zimbalist Jr. — Alfred Pennyworth
• Mel Winkler — Lucius Fox
• Marilu Henner — Veronica Vreeland
• Tim Matheson — Michael Vreeland
• Linda Hamilton — Susan Maguire
• Ed Gilbert — Photographer
• Bruce Gilbert — Mr. Liu

• Poison Ivy's last appearance in Batman: The Animated Series.

• Elements of "The Promise" theme from film "Mask of the Phantasm" can be heard when Bruce announces his intention to give up being Batman.

Many past Batman supporting characters make cameos at Bruce's wedding. The guest list includes:

• Leslie Thompkins

• Dr. Kirk Langström and his wife Francine (both last seen in the Batman: the Animated Series episode Terror in the Sky).

• Summer Gleeson

• Jack Ryder

• Zatanna

• Jason Blood