The Omnidroid City

 is a limited-time attraction released with the Incredibles Event Update on 15th June 2016. It is unlocked after completing the Take Down Downtown quest.

Trivia

 * was a Legendary Chest prize in The Incredibles Chest Promotion on 6th January 2017.
 * The rewards decreased from XP (23), Magic (115) to XP (14), Magic (80) with the ? Update on 12th April 2017.