Board Thread:Questions and Answers/@comment-26406945-20150413150636/@comment-218.102.176.65-20150815134238

No, it's because in the mission the wrecked Monkey Sub had First Strike Capability before it got wrecked, so I suggest that when the time is right, you may have to sell some of your towers until your in-tower-defense cash reaches 8,000 or more, and then repair the wrecked Sub, and when the ZOMG comes, use the Activated Ability to annihilate it completely in a single blow. Simple (but not easy, of course.  My defenses have never lived to try this before but I did try to do the mission anyway, and I know how it must be done in the later rounds because of how long I have been playing BTD5, and therefore, except for the Abilities granted by Specialist Buildings,  I know every upgrade and every Ability about all the BTD5 towers).