Culled from the Peter Davidson era of the show, VISITATION is another classic installment in the DOCTOR WHO saga. A trip to Heathrow Airport to drop off Tegan results in the TARDIS vaulting back to the 17th century by mistake. Aliens have also landed, and are intent on wreaking havoc on the earth. Facing a formidable opponent, the Doctor and his crew must draw on their resourceful natures to save the earth.