Tenchi Muyo! Ryo-Ohki S02E04 - The Advent of Goddess

The dastardly Dr. Clay, acting on the orders of the mysterious Lady Tokimi, sends his robotic slave Zero down to earth to capture Washu. Zero transforms into an exact duplicate of Ryoko to infiltrate the Masaki household, but repeatedly fails to carry out her mission as she simply cannot cope with the wave of emotion she experiences when she is near Tenchi!