The Activator Bloon is a grey bloon with an exclamation mark on it. Activator Bloons are immune to sharp attacks much like the lead bloon, but are also immune to energy/light. They move at the speed of a green bloon and when destroyed, they turn all Outline Bloons into Lead Bloons. Activator Bloons can be customized to trigger attacks, spawn bloons (from the start) and whatnot, and pop into a lead bloon when destroyed.