The series aired from August 11, 1991 to June 8, 2004. The show originally revolved around a group of toddlers, Thomas "Tommy" Pickles, Charles "Chuckie" Finster, and the twins Phillip "Phil" and Lillian "Lil" DeVille. The toddlers are able to communicate with each other through baby speak, although viewers can understand them, because it is'translated''. Often, they mispronounce words or use poor grammar and their speaking is full of malapropisms. An example of this is using the word "poopetrator" instead of perpetrator.
The group is often reluctantly joined by Tommy's cousin, Angelica Pickles. At age three years old, Angelica is able to communicate and understand language from both the toddlers and the adults, which she often uses as an advantage when she wants to manipulate either party. She is usually very mean to the babies. Susie Carmichael, who lives across the street from the Pickles, is also able to communicate on the same level as Angelica, though she isn't manipulative. As a result, Angelica and Susie often clash.