Contingency:Halt Doof's Invasion

Last mission,The Gulag:Saving Lt. Phineas is in a gulag and Isabella's squad rescued him and succesfully extract him out.Now,Phineas is back as a squad leader.The squad assisting Phineas to take over the LOVEMUFFIN's submarine to launch a nuclear missile and halting Doof's another wave of invasion.

Plot
The squad paradropped from a plane.Phineas and Isabella landed near a same place,while Baljeet,Buford and Irving landed near Ferb which is a few miles away.They'll regroup if possible.Phineas and Isabella stealthily slip past the enemies and shoots which is blocking the route.They moving into a forest.Suddenly,two IFVs (Infantry Fighting Vehicle) found them while scouting the area.The duo ran into a forest and hiding into a bush.The IFVs can't chase due to a tight space.The shots from the IFVs attracted some soldiers thats also inside the forest.The soldiers trying to find the duo.Again,they stealthily slip past the soldiers.They finally reach the other side of the forest.

After the forest,they reach a hill overlooking a village.Candace says to Phineas Be advised,a UAV(Unmanned Aerial Vehicle) loaded with AGMs (Air-to-ground missile)is in the airspace.Phineas tells Isabella to take control the missile.Suddenly,a SAM (Surface-to-air missile) destroys the UAV.Phineas reported to Candace that the UAV was destroyed.Candace tells him that another UAV will be on station.They moving into the village where they meet Ferb and the rest of the squad.Ferb destroys the SAM vehicles.Phineas says "Good effect on those SAMs" to Ferb.They moving deeper into the village,meeting medium resistance.After a while,they reached the sub base.Candace tells Phineas "Another UAV is on station.Make it count,this thing doesn't grow on trees."Phineas again orders Isabella to control the missile.Isabella shoots the missile at an IFV.The explosion attracts everyone in the base.

An enemy helicopter take off and shoot at Phineas' squad.Isabella use the missile to destroy the helicopter.The squad rush to the sub,but Phineas told them to provide support at tower.Phineas gets inside the submarine.Isabella told the rest to keep the enemy from the sub.The squad saw the submarine's missile silo door opening.Isabella tells Phineas "Phineas,the missile doors are open!"Phineas replies by saying "Good".A nuclear missile suddenly launch from the submarine."We have a nuclear missile launch!Missile in the air,missile in the air!Code black,code black!".Isabella reported to Candace.