Rigel 7 Military Base

The  is a limited-time premium building that was released on October 15, 2021, as part of Act 2 of the Treehouse of Horror XXXII Event. Upon completion, Mecha-Chalmers is unlocked.

Regular
Mecha-Chalmers Skinner
 * Reload Weapons Systems - 12h
 * Try to Get His Own Mech Suit - 3h

Event's Quest Based
Chalmers Character Groups
 * Take Command - 4h

Springfielders
 * Enlist in the New Army - 4h

Trivia

 * Only one can be obtained.
 * It can be placed on grass, pavement, dirt, krustyland road, boardwalk, pier, edge of boardwalk, or edge of pier.