Voltron: Legendary Defender (season 2)

The actions of this animated TV series begin to unfold at the moment when a group of researchers turned out to be taken by mysterious and aggressive aliens who were on the Plutos satellite. The authorities, after the discussion of the problem, had come to the conclusion that they need a silence and did not need a panic, so, on the Earth, they declare the space mission failed because of a piloting mistake. The most people believed them, but Keith, a daughter of one of the researchers, refuses to believe in it.