The tutorial mission is basically the same as in the retail game but uses a different map.
The first mission.
The first mission's briefing. All characters in the demo campaign use generic portraits, like the Magistrate has the Battlecruiser pilot portrait.
Confederate Alpha Squadron staging area on Chau Sara.
The first encounter with the "xenomorphs".
Cerberus units are more powerful than their regular counterparts.
An attack on the Sons of Korhal base.
Fresh forces mop up the rest of the rebel base.
You need to rescue the scientists in the indoor mission.
Fighting the Zerg in the lower levels of the Confederate research installation.
Attacking the Zerg base in a mission exclusive to the CD version. The objective here is to escort Cerberus operatives to the installation entrance.
An attack force backed up by two SCVs for in-field vehicle repairs.
The Zerg are ravaging a Terran city...
...until General Duke personally arrives to fend them off.
Campaign mission selection screen (CD version).