Several rich industrialists are invited to the Eternal Youth Health Spa, and that's where they are last seen before disappearing. The only connection: they had something to do with the death of plants. Bruce Wayne also receives an invitation (although it was one of his greedy directors who nearly made the deal to destroy a rainforest before Bruce forced him to shut the operation down), but Alfred and his 'lady friend', Maggie, go in his place. When they don't return, Batman is forced to investigate, discovering that the spa is run by Poison Ivy, and that she has been using a formula to turn the industrialists into humanoid trees, including Alfred and Maggie.
Batman The Animated Series was a cartoon that premiered on September 5, 1992, based on the comic series created by Bob Kane, as well as the Burton movie adaptations. The series focused on the adventures of the alter ego of millionaire Bruce Wayne, Batman, a dark vigilante hero who defends Gotham City from a variety of creative and psychotic villains. The highly successful series merged stylish animation and fantastic storytelling more in the style of radio plays than typical cartoons.