Slopp, along with Yanta, were the Trimestrian Jillonga's children.

Seeking revenge on the Doctor for her husband's death, Jillonga took her children out of school on a sixty-year journey to 21st century Earth so they could see her revenge. When Mickey Smith was brought aboard the spaceship to be questioned about the the Doctor for the return trip, Mickey tricked Jillonga's children into playing a game where he waited outside the airlock until he knocked. With the ship unable to change course on its return trip home, the ship launched, and Mickey was left behind on Earth. (PROSE: Taking Mickey)

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