From StrategyWiki, the free strategy guide and walkthrough wiki

Stage	Chapter 25:Lab Rats
Winning Condition	Annihilation Victory or capture HQ
Player Commander		Opponent Commander
Name	First none but latter Will	Name	Tabitha
Faction	12th Battalion / 12th Independent Legion	Faction	IDS

In this mission the player is no CO for a few days and only had a few units. Tabitha of the IDS is going to defeat Tasha and Gage once and for all because the Great Owl is destroyed. The few units a duster, a mech, a tank, a medium tank and an AA unit which is all remains against Tabitha. Tabitha said once she rids them from the world her fathers experiments will be over and the world will belong to the IDS. During the battle Lin and the others survived and came back with additional rreinforcements and defeated Tabitha and she requested more toys but her father was angry. After the battle Will found Cyrus and he told Will about the Cure for the Creeper and Caulders HQ the nest. Cyrus died because of the poison that Caulder put into him.