Starcraft 2, Brutal difficulty walkthrough with commentary
Mission 13: Echoes of the Future
Guide Zeratul to 4 waypoints, while absorbing large zerg attacks. This mission gets much easier if you place cannon walls at each of your bases. Don't forget to use pylons to power up the extra buildings. While the enemy attacks in great number, their bases are lightly defended, and you will have no problem clearing them. The waypoints heal Zeratul, so keep that in mind if he gets injured. You want to expand to the nearby base as soon as you possibly can, because you need a lot of income for cannons and colossi.
Starcraft 2 Mission 13: Echoes of the Future walkthrough on Brutal (w/commentary) Part 1 of 2
Starcraft 2 Mission 13: Echoes of the Future walkthrough on Brutal (w/commentary) Part 2 of 2