Doris is a dolphin who appears to be wild as Kowalski tracks her who is spoken of in several episodes, but as of yet unseen. As shown in "Hot Ice," Kowalski sees her as a love interest, though it appears to be unrequited (since Doris wanted someone "hipper").
Doris will be shown in the upcoming Blowhole special, "The Penguin who Loved Me". She will be voiced by Calista Flockhart.
Read more about this topic: List Of Madagascar Characters, Other Characters Exclusive To The Penguins of Madagascar