From SC2Pod
Lore
With skilled pilots at a premium, the Protoss have turned to robotic Shuttles to ferry troops over rough terrain and into hostile territory. They are equipped with powerful thrusters, allowing them to carry even massive Reavers within their hulls, but they are not armed with any defensive systems other than a basic energy shield.
Abilities
Transport (SC1)
Upgrades
Gravitic Drive (SC1)
StarCraft 2
The Warp Prism has replaces the Shuttle in the role of the primary transport unit of the Protoss.