Them!

 is a premium limited time questline released on September 3, 2015, during the Monorail 2015 Event. The first part shown when the player logs in on September 3 and is dialogue only. To start the second part of the quest, the player has to buy a Robot Ant. ( Mechanical Ant Alpha, Mechanical Ant Beta, Mechanical Ant Delta or Mechanical Ant Gamma.

Them!
"Make a boy's wish come true! Giant Mechanical Ants now available in the store!"

- In-Game Message