Dark Origin
On the ninth mission of zerg episode IV If you Complete with at least five minutes left (Destroying the protoss base) then You will do a secret mission called dark origion, where you start out with a few dark archons, zeratul, and maybe some other protoss units (not giving away any spoilers so you can see for your self however it is challenging). This level is inaccesible from the menu so you can only acces it by doing the 9th zerg mission and winning it in under 5 minutes.
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