Echoes of the Future

The Zerg have several strongholds and have also taken over a few Terran base remnants. You'll only have control of a single Protoss base, so you'll need to have both a strong offensive and defense. Turrets, zealots, stalkers, and colossi should be the backbone of your army. The Zerg will launch Nydus worms every few moments, which should be your prime target.

When the worms are dealt with, leave a decent force at your base to guard against Zerg assaults, while your main army heads for the Overmind tendrils. Zeratul is good for taking out enemy with his cloak, but remember that overseers and spore crawlers can spot him. With each secreted position, bring Zeratual towards the tendril to learn the Overmind's secrets.