The mighty titan in radioactivity and your nightmares, the F.R.A.N.C.I.U.M.
The F.R.A.N.C.I.U.M., or Fearsome Radioactive Anti-monkey Nuclear Crushing Incredulous Uber Mondoblimp, is the final Alkali Bloon.... for now. At a crazy 8000 hits, it is mostly unstoppable. Because of its 6 propulsion engines, it is unaffected by the Cripple MOAB ability entirely. Of course, with all this power comes great.... slowness. It travels at a speed of 0.09 relative to the Red Bloon, which is only half as fast as the feared ZOMG. It contains 4 C.A.E.S.I.U.M.s, making its RBE an incredible 224880. It does two things: Any tower that is not a Super Monkey or a building/machine takes 2 damage a second because of its radioactivity, although this comes at the expense of 0.5 layers a second. The second thing is that, when popped over water, it creates an explosion comparable to a nova, dealing 100 damage to all towers in the radius of a 0-2 Tack Shooter. This bloon is what nightmares are made of.