None whatsoever.
yes there is a chance it will happen if scientist mess up but it will most likely not happen
A zombie invasion is just an outbreak of zombies like a takeover
Yes, you can get rusty fragments from successful invasions. The chance of getting one is random.
no
If you invade every time you can, your zombies are not hungry. Track their hunger on the zombie status screen. The more hungry they are, the less likely they are to get distracted. At starving, they never get distracted. After each invasion they are full.
A zombie plan is a plan people make on what to do in case of a zombie invasion.
Zombie Invasion Pewaukee - 2011 was released on: USA: December 2011
No
Oh, my friend, there was no need to worry about a zombie invasion in 1599. That was a time of great exploration and creativity, not of the undead wandering the countryside. Just imagine the beautiful landscapes and peaceful villages that existed back then, untouched by such spooky tales. Let's focus on the positive and paint a happy little scene instead.
That is unlikely to ever happen.
December 21, 2012
It is very much possible, and is the most common way to aquire brains. When you press the button that selects your opponent, it will tell you your chance of getting a brain. Excellent is the highest chance, and horrible is the lowest.