Dorothy

Dorothy appears on the "Elmo's World" segment of Sesame Street as Elmo's aquatic pet. Dorothy is a good friend to Elmo, who can understand what she's saying through her goldfish bowl. Dorothy is inquisitive and possesses an active imagination. Whatever topic is explored, Dorothy mentally pictures a version of Elmo in an appropriate role or form.

Dorothy is not a Muppet, but is portrayed by a real, live goldfish. (Or, given that eight years is an atypical lifespan for even the most gifted goldfish, one might say that Dorothy has been portrayed by a series of goldfish.)

First introduced on "Elmo's World" in 1998, Dorothy has also made appearances in the main Sesame Street storyline, beginning in 2000, thus demonstrating her independent existence outside of Elmo's imagination. Episodes in which Dorothy has played a key role in the main street action include the following:
 * Episode 3918 - Elmo takes Dorothy to Dr. Gina for a checkup.
 * Episode 3938- Maria takes care of Dorothy, Telly's hamster, Herry's bird, and Gabi's friend's rabbit, all while she's trying to work.
 * Episode 4042 - Elmo must select a fish-sitter for Dorothy before accompanying Gordon to a sporting event.
 * Episode 4058 - Dorothy is amongst the competitors vying for the title of "Best Pet in the World."