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troperville

Several plant-related crimes (in which greenish beasts attack wealthy bachelors, steal money, and poison them) take place. The prime suspect of this is Poison Ivy, now out of Arkham Asylum and married to a biology professor, with two children, Chris and Kelly. Batman spies on Poison Ivy and finds nothing out of place. After Robin kidnapped and held for ransom by one of the plant beasts, he explains to Batman that the professor doesn't have custody of his children, and that Chris and Kelly are girls. Breaking into Poison Ivy's greenhouse, Batman finds a bed of plastic fruit and opens it to reveal a lab. There it turns out that the professor was kidnapped and had his DNA being used to create disposable plant people with his DNA: first resembling children (Kelly and Chris), then turning into a clone of the professor, then becoming a giant beast. However, Batman and Robin never manage to catch Poison Ivy, because she is also a clone.

Tropes

Continuity Nod: As Poison Ivy flees at the end of the episode she looks over a photo album of her time in Gotham. Included in this album is a picture of Bruce Wayne & Harvey Dent (A reproduction of their groundbreaking at Stonegate Penitentiary in "Pretty Poison") and a picture of Ivy and Harley Quinn (A reproduction of their team-up in "Harley & Ivy").
Daylight Horror: The episode shows one of the few times where Batman's in action in broad daylight. The reality behind Poison Ivy's new domestic life is no picture-perfect fairy tale, either...dear God, the "cabbage plant kids"...
I'm Melting: When several of Poison Ivy's "children" come in contact with weed killer.
Tomboyish Name: Batman observes some heartwarming interactions between Pam and her stepsons, Chris and Kelly, but knows something's up once Robin says he knows the "husband" and his daughters.
Was It All a Lie?: The marriage was a sham, and she wanted to have a family on "her terms", but was Ivy lying when she told Batman she really was happy? No.