The show features an eight-year-old boy named Diego (voiced by Jake T. Austin, Seasons 1-3; Matt Hunter, Season 4; Brandon Zambrano, Season 5), who helps animals in danger, mainly in the rainforest. His cousin is Dora (voiced by Kathleen Herles) from "Dora the Explorer", as revealed in multiple episodes. Diego was first introduced in an episode of "Dora the Explorer" entitled "Meet Diego!" (originally voiced by brothers Andres and Felipe Dieppa). Dora makes several appearances throughout the series, usually without Boots by her side.