Maggie in Peril: Chapter One is the forty-sixth Simpsons short and originally aired on The Tracey Ullman Show April 30, 1989. It is the only two-parter episode in the Simpsons shorts.
Bart and Lisa do a poor job babysitting for Maggie when Dad and Mom leave to go shopping for weed killer. Unsupervised, Maggie hops on Bart's skateboard and rolls through a sewage pipe to a waterfall. As she goes over the falls, viewers are told it will be continued the following week.