Juggernaut

"Hurls a giant unstoppable killer spiked ball that can pop lead bloons and excels at crushing ceramic bloons."

- BTD5 Description

 is the final upgrade on path 1 for the Dart Monkey in Bloons TD 5 and it is unlocked at Rank 19. It shoots a big ball that can pop Lead Bloons and does 5 damage to Ceramic Bloons. In Bloons TD 3, it was an upgrade for the stand-alone tower Spike-O-Pult that allows it to fire further. It costs $1275 on Easy, $1500 on Medium and $1620 on Hard. 

Trivia

 * The Juggernaut pops a maximum of 100 Bloons each shot, just like the Ray Of Doom.
 * In Bloons Tower Defense 5 iOS, the ball can only pop one Lead, due to the shortened description of the upgrade. This has been fixed.
 * The artwork of the Juggernaut shows the monkey sitting on top of the spiked ball. Ouch!
 * With the Splodey Darts upgrade in Bloons TD 5, it can have exploding spiked balls, but only if they reach the popping limit.
 * Juggernaut is best placed at the end of a long, straight road to make best use of its long range and high bloon popping capability.
 * In Bloons TD 5, the Juggernaut upgrade gives the Spike-O-Pult extra range.
 * This is the only Dart Monkey upgrade that can pop Lead Bloons in Bloons TD 5, unless you include the premium upgrade Splodey Darts.
 * It is also good at popping Camo Leads.
 * Setting the Target Priority to last is usually better, depending on the position.
 * If you place a 2-0 Dart Monkey near a Dart Monkey with Super Monkey Fan Club upgrade, then use the ability, wait for the 2-0 Dart Monkey to transform into a Super Monkey. Then, upgrade it to Juggernaut and it change into a Juggernaut Dart Monkey that shoots as fast as a Super Monkey for the duration of the Super Monkey Fan Club ability. It also works with Spike-O-Pults. This will only work once.
 * The Juggernaut ball can pop frozen bloons.
 * The Juggernaut isn't firey or explosive, but it's so heavy they can crush instead of blow up lead and frozen bloons.
 * Juggernaut is the cheapest final upgrade, costing $1500, second being the Sabotage Supply Lines ability for Ninja Monkey costing $1800, and third being the Absolute Zero ability for Ice Tower costing $2000.
 * When a Temple Of The Monkey God sacrifices a Juggernaut, it will not shoot blades like mostly 4th upgrade towers, it will shoot darts like unupgraded towers, (with the exception of Monkey Apprentices, Super Monkeys, Mortar Towers, Bomb Towers, Glue Gunners and Ice Towers). However if a SMFC is sacrificed, it will shoot blades.