Not actually a supplement. It's a fast play scenario, with pregens only, and barely enough of the rules to qualify as "playable without the core."Bzzz! You're out! ;-)
WotC made an expansion for the Alternity RPG for StarCraft.
Alternity: StarCraft Edition was an Alternity game system table-top roleplaying game set in Blizzard Entertainment's StarCraft universe. It used much simpler "fast play" rules rather than the full Alternity rule set. It comes with three pamphlets, a GM's card, and a set of dice. The adventure...starcraft.fandom.com