ThatOneServant
In a vacation-gone-wrong situation, the Holts and two family friends, Takashi Shirogane and Lance McClain, finds that something goes terribly wrong on their spacecraft. Two strangers with a thirst for Shiro's blood hides aboard, threatening them with Matt's children as captives. In a fleeing moment, Katie shoots the man, the control panel, and a crack into the front window.
Then the ship went down onto an unknown planet.
I do not own Voltron or the characters :)