The Stolen Lion Voltron: Defender of the Universe : Season 1 Episode 8

The Princess is undergoing rigorous training in her Lion, fighting with Lance's Lion as if it's a real battle after taking a hard hit from one of his assaults, the Blue Lion plummets toward earth in a tail spin. She is saved, not by any of the VF rushing to aid her in their Lions, but by the tractor beams from a ship piloted by a mysterious stranger.