Warcraft III: Reign of Chaos (Demo Version)
Even though the first two missions are the same as in the retail version, the loading screens are completely different.
The scene is set for Thrall's adventure: his fleet of commandeered Alliance ships has to seek refuge from the storm on an unknown island.
That Troll provides a side-quest involving a search for some ingredients so that Sen'Jin can purify the defiled Fountain of Health.
Quest completed, and you also get a little reward (besides being able to heal your units near the fountain) - healing wards Thrall can carry around.
In the dungeon level, both Orcs and Alliance troops are prisoners trying to escape. Still have to battle each other though.