We were one short of a full group so I (Mike) ended up playing two heroes. Brian took over Overlord duties for the week.
Valerie selected The Cardinal's Plight as the quest. In the first encounter, the evil Lord Merrick Farrow is attempting to raise zombies from the graveyard to attack the cardinal. After a relatively good travel period to the location, the heroes had to run past some dragon's, fight past some flesh moulders, and find the key to the portal. That part was relatively simple but led to the big mistake that ended up giving the Overlord the full victory.
So despite opening the portal relatively quickly, the heroes were now stuck with the task of taking out the dragon. Which didn't happen. Between the darkness/fog/whatever the dragon hampered the nearby heroes with and the complete lack of any offensive capability for the warlock (being knocked down meant she couldn't summon stones to supplement spells), the dragon was an unbreakable wall.
By the end, the heroes simply looted everything they could. They'll start the second encounter badly hurt and it should be over quickly. (Al, if you ever wanted to play the Overlord, next week will be the time to do it!)