After Shock functioned as a walker utilized by the Galactic Republic. During the time of the Eternal Empire conquest, the Eternal Empire seized the walker and transported it to Zakuul. Ultimately, Zotar, the Exarch governing the Old World, acquired the walker and took part in gladiatorial battles within the Arena Grand. In the year 3630 BBY, Zotar's position as the Eternal Champion was contested by "the Mysterious Stranger," and he engaged his opponent while piloting After Shock. Despite his efforts, he suffered defeat, and the walker met its destruction.