Rugrats is an American animated television series created by Arlene Klasky, Gábor Csupó, and Paul Germain for Nickelodeon. The series premiered on August 11, 1991 and aired until it's cancellation on May 22, 1994. It was then revived after two Jewish Holiday Specials in May 9th 1997 and ran for a longer period until its last episode in June 8th, 2004. Along with Hey Arnold!, the show focuses on the little babies and their day-to-day lives, usually involving common life experiences that become adventures in the little babies' imaginations. It was aired on Nickelodeon, and before SpongeBob SquarePants overtook it, was the longest running show on Nickelodeon.
The show originally revolved around a group of the little babies, Tommy Pickles (whose family moved from Akron, Ohio to their current location in California), Chuckie, Phil, and Lil. Tommy's dog, Spike, was also a main character in the series. The little babies are able to communicate with each other through baby speak, although viewers can understand them, because it is 'translated'.
The group is often reluctantly joined by Angelica, the older girl, she's three (Turned four in a later episode, but this was reversed through negative continuity), Angelica is able to communicate and understand language from both the little babies and the adults, which she often uses as an advantage when she wants to manipulate either party. She is usually very mean to the little babies. Susie, 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 and aren't friends (But in All Grown Up they eventually have a better friendship).
When the show was revived, the plot was radically changed from the original, and in 1998, a new character was introduced. After The Rugrats Movie, in which Tommy's younger brother Dil is born, he was soon added as a character on the show. As a four month old baby, Dil is not able to communicate with anyone. Later in 2000, after Rugrats in Paris: The Movie was released, Kimi was added as a character. She is Chuckie's stepsister (Later real sister after they were adopted).