When the base is hit, Zory spawns as the boss with a Gory.
Farm up some cash early on while keeping an eye on the Znache that will be burrowing past your main team.
Zigge is a bit of an annoyance, his burrow range is very short and he has a high chance for a knockback. This means that he can get inbetween your dps and your MS and tear up your back line no problem. Be cautious of this and if you need to use you cat cannon to reposition Zigge then do that.
When Zory spawns you will want to keep him from immediately reaching your base or your dps so save zombie killers for when he surfaces. Only 1 Zory spawns but he hits hard so be careful. More Zigge can spawn at this time and really mess up your spawn flow.
When the base is hit, Zory spawns as the boss with Gory and Those Guys spawning sporadically as support.
As always, The Thrillerz must be dealt with as early as possible. Forcing them to burrow twice is tough but fast meatshields can make it happen easily. The Znache kinda hurt but at least the B.B. are free money.
Reminder that Zigge can get behind your MS cats and tear up your dps. Prepare for this!
At 99% health the base knocks you back and spawns a Zory, a Gory and Those Guys with him. The Zory will burrow immediately so its a good idea to keep zombie killers on reserve for after he surfaces. You will still be dealing with The Thrillerz and Znache too so if you have rare ZK units like Weedwacker or Ectoplasm cat you should definitely bring them.
Once Zory is dead you may have another Zigge to deal with but that's really it!