We've finished with the canonical Marathon Trilogy and are moving on to third party scenarios, starting with EVIL. In this scenario, a UESC ship from Tau Ceti runs into a spatial anomaly that sends them far away where we encounter something dark and evil.

Our job here is to destroy the facility (built inside a volcano) by causing it to fill with lava. Aren't volcanoes already filled with lava?

I'm still not sure if we played this level the right way or not. My idea was that the four lava gates need to be destroyed in order to progress; they made noise when shot. I thought maybe they looked more significant with the original textures, or displayed damage, but I went back again with all HD textures off, and they don't. Instead, Blackstar managed to do the grenade hop I failed, and we completed the level that way.

EVIL can be played, like the other Marathon games, using the open source Aleph One engine which you can get here for Windows, Mac and Linux:

http://source.bungie.org

EVIL and other third party scenarios for the Aleph One engine can be downloaded here:

http://source.bungie.org/scenarios.php#more

We use irons' Co-Op script, which gives weapons and ammo to both players if either picks any up, and prevents weapon loss on death (so items can't be destroyed in lava or slime). The script also allows one player to teleport to a destination set by themselves or their partner, in case co-op players run into a problem a solo player would have to restart for.

http://simplici7y.com/items/co-op

EVIL has its own spoiler guide:

http://marathon.bungie.org/spoiler/evil/

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Music used in this episode:

"What About Bob?" by Alexander Seropian, remixed by Craig Hardgrove (intro music)
"New Pacific (Reprise)" by Alexander Seropian, remixed by Craig Hardgrove (outro music)

Marathon,Marathon Infinity (Video Game),Bungie,Bungie Studios (Organization),Cooperative Gameplay (Gameplay Mode),Cooperative Game (Game Genre),Let's Play