the tank 5-1 is the Final Boss Of Doom tank. Your mission is to defeat the boss and protect your pets.After that you will get a new pet (Presto) and unlock the Challenge mode and Sliver Trophy.The bosses name is Cyrax. He is really easy if you just focus on the minisylvesters and the other aliens.
!PROTEST!
You do NOT get the silver trophy after this fight! Don't listen to him! You get it after purchasing all the bonus pets and pet upgrades!! Also, this fight is not as easy as this guy claims! Try it and see!
You dont get it the Silver trophey that easy. you get after perchaseing all bonus pets and upgrades AND all stories in Challenge mode.70.132.204.203 18:39, June 1, 2010 (UTC)Wrote by Cyrax Evil Alien Mastermind! Ah, hahahaha!
