 This story features "the Blathereen", a family of Raxacoricofallapatorians distinct from the previously seen Slitheen.In the story, the Blathereen, a family from Raxacoricofallapatorius, gift the Earth with a plant from their homeworld via the ambassadorship of alien investigator Sarah Jane Smith, as an apparent token of apology for all of the past transgressions the criminal family the Slitheen have committed against the human race.The story begins with Sarah Jane and her companions chasing an overweight boy.