The StarCraft II Tutorial is a four mission training campaign that introduces the three races and the basics of gameplay for each race. The campaign was introduced in patch 3.0.0. Its story involves the investigation of the planet Taurus IV and the disappearance of a Terran Dominion scientist team there.
The tutorial missions will automatically load when an account is first created or the player goes to a region where they have not previously had an account. For accounts made after Patch 3.0.0, they can be accessed through the menu button in the StarCraft II main selection screen.
If the mission select screen is left up for long enough, the adjutant will have special quotations.