The Doctor, Amy Pond and Rory Williams arrive on the planet Velgris, a planet 40% covered in fruit trees which produce a different fruit every week. The native Velgors are singing to the trees in praise of that week's harvest. Suddenly their peaceful chants are interrupted and the sound becomes distorted. The Doctor discovers finds a remote-controlled device. The distortion causes the trees to bear mutated fruit that creates something new. The "fruit" calls itself the Berrus and declared the planet selected for clearance and reseeding and the natives for consumption.