You have a Special Agent. These are one-use items that can help you win. Some items are towers when placed, others are special powers that are activated. You can see how many Special Agents you own on each Special Agent button.
~ Description after playing a track and owning a Special Agent for the first time
Special Agents are special towers or abilities that were introduced in Bloons Tower Defense 5 and appear in every game after (excluding Bloons TD Battles and Bloons Monkey City, though their mobile versions allow Monkey Farmers to be pseudo-Special-Agents). Unlike regular towers, they cannot be found in normal game play. Instead, you have to pay Monkey Money to hire them. To hire them, click on the tent with the camouflage pattern on the homepage. Each agent has its own power and can only be used once before it must be purchased again. Special Agents can also gain permanent upgrades called Special Agent Pros once used a certain amount of times.
Shoots out bees that pop all layers of bloons quickly. Extra useful against Regrowth Bloons, as they will not regrow with a bee on them; however, the bees cannot pop leads or frozen Bloons. As a pro, it also has the ability to send 100 bees at once.
Slowly shoots acorns that only pop one bloon layer at a time. Squirrel goes angry (shoots extremely fast) if bloon(s) are leaked. When this happens, it can detect Camo Bloons and pop leads. This rage only lasts for a few seconds. When angered, the squirrel will grow bigger and turn green. As a pro, the Angry Squirrel Pro also gets angry after popping 50 bloons.
Grows 5 thorns per round (10 in Bloons Tower Defense 5 Mobile), with 200 at the most. Each thorn pops one bloon layer. When a bloon touches it, a layer pops and a thorn vanishes. Stays on screen if all the thorns disapear, with no thorns (until the round ends). When it becomes a pro, it also adds "creepers" which appear after every 3 rounds. The "creepers" pop additional bloons.
Wipes ALL bloons from screen including MOABs and BFBs. Does 1000 damage to ZOMGs, but does not destroy them. Also a good lag-reducer. As a pro, it sends another wave of Super Monkeys two seconds after the first wave.
Special Ability - Generates a powerful beam that can utterly destroy anything but ZOMGs, it follows mouse similar to The Ray Of Doom, however, comes from above. Dissipates after short time. The pro version doubles at the point of impact and leaves a trail of plasma that damages bloons and MOAB-classes until the plasma is spent or dissipated.
Can be placed on land, water or some of both, throws spears and coconuts, coconuts do extra damage to Ceramic Bloons and can pop lead and frozen bloons. Shoots a spear and then shoots a coconut in a pattern. The pro version can throw spears and coconuts simultaneously.
Just like the Pontoon, but it is the opposite version. It is a giant pool with water in it, you can place it on any land surface. Any units that can function on water can be placed in this. The Portable Lake Pro is capable of attacking only by using the Activate Sea Monster! ability.
It fills its cheeks with watermelon, and then attacks with a rapid fire burst of seeds. The pro version greatly reduces its cooldown time (which is the time required to eat another melon), and also shoots a whole watermelon every second shot.
It doesn't attack but picks up bananas from Banana Farms within its range. It will attack as a pro, which will shoot collected bananas along the track to slip passing bloons in a similar way to the Ninja Monkey's Distraction effect.
It attacks by throwing snowballs at bloons, which pop before freezing. It disappears after 10 rounds. The pro version attacks faster, has an ability that involves throwing snowballs at hypersonic speeds for 10 seconds, and the agent disappears after 20 rounds.
The Super Monkey Storm is also the only special agent that isn't new in BTD5, it has appeared as a tower in BTD3 and an upgrade for the Monkey Beacon in BTD4 (Beekeeper is a tower in BTD4 iOS, but that update to the game was made after BTD5).
You cannot use Pontoons, Monkey Farmers, and Portable Lakes in this mission. This is because firstly, there is no water on the track, so you cannot place Pontoons. Secondly, Monkey Farmers can only collect bananas from Banana Farms, which disabled, making the Monkey Farmer useless. Even in its pro version, the Monkey Farmer needs to collect at least one banana from the Banana Farm to start attacking, so it is also practically useless. Lastly, the only special agent that can be put on water is the Tribal Turtle but it could be put on land as well, making the Portable Lake useless. This might not apply to the proversions of Pontoons and Portable Lakes as the Portable Lake Pro can attack and also support a Pontoon Pro, which enhances the range of towers on it. You still, however, cannot place them.
It is also the only Special Agent that attacks via ability that cannot attack any other way to take up space when not in use. Since the Super Monkey Storm disappears after use and the other towers can attack in other ways, it makes this tower useless until the ability is activated.
Special Agent Pros can be unlocked for each Special Agent if used a certain number of times. These usually decrease with an increase in cost.
The Tribal Turtle is the only Agent that can go on both land and water.
The Monkey Farmer, Pontoon, and the Portable Lake are the cheapest Special Agents costing only 40 (as well as the cheapest pros). They are also the only special agents that are inanimate objects besides the Bloonsday Device (excluding the Monkey Farmer, since monkeys are not inanimate).