Spies have the ability to sneak into many enemy structures. One of
the most useful is the Battle Lab. When you get a Spy into an enemy
Battle Lab, you gain the ability to create a new infantry unit. There
are four possibilities.
The most basic tactic is sneaking an Allied Spy into a Soviet Battle
Lab. Do this, and you will be able to build Psi-Corps Troopers. These
are effectively Allied Yuris, and behave exactly the same way. They’re
nice to have, particularly if the enemy is using Yuris against you.
Get an Allied Spy into the Battle Lab of an enemy Allied army and
you get the ability to create Chrono Commandos. These units are loads
of fun and extremely useful. They move across the map like Chrono Legionnaires,
but otherwise act like Navy SEALs. They can use C4 on any nearby structures
and kill infantry instantly.
A slightly more esoteric unit comes about when a Soviet player gains
the ability to create Spies and gets one into an Allied Battle Lab.
The new unit is the Chrono Ivan, a combination of a Chrono Legionnaire
and a Crazy Ivan. This unit has all of the abilities of Crazy Ivan,
but also can chrono across the map.
The rarest unit is gained by getting a Soviet Spy into a Soviet
Battle Lab. The result is Yuri Prime, a super-powered Yuri unit so
deadly you can only have one at a time. Yuri Prime is really no different
from a normal Yuri unit, but his range is much farther; he’s effective
at about the range of a British Sniper, or almost a full screen away.