Planeta U (English: "Planet U"), usually referenced as Tu Planeta U ("Your Planet U") is an American children's programming block that airs on the Spanish language television network Univision, which debuted on September 15, 2001. The three-hour block – which airs Saturday and Sunday mornings from 8:00 a.m. to 11:00 a.m. Eastern Time and Pacific Time – features animated series aimed at children between the ages of 2 and 8.