Manannan's House (unofficial)

In King's Quest ZZT, Alexander returns to the house to find a key in the ruins chicken coop. He uses the key to enter the basement of the house through a cave near the base of the mountain. Inside of the celler he discovers that Manannan still lives in the house, along with several of Ravenlos' soldiers. In King's Quest ZZT 2, Alexander returns to the house and discovers that it has been reinforced and enlarged. He again finds a key in the henhouse, which opens a door inside the cave near the base of the mountain. Entering the celler again, he discovers that Manannan's celler has been converted into a great underground base. The first room was a warchamber. A giant round table had placed in the room. Alexander encountered a general and a few guards in the room. After defeating the guards, the commander ran off into the next room. Alexander checked out a small storage room, and accidently set off some gunpowder, causing an explosion and starting fires in the warchamber. Alexander then went upstairs into the next chamber, a large hall with tiled floor. The general seeing him, ran north and locked a gate behind him. Alexander headed into western room, avoided some spike traps to reach a green key and returned to the hall. He used the green key to open a gate in the western side of the room. This lead to a labyrinth guarded by a Thing, a green venomous ball of slime. Alexander was chased around the labyrinth and barely avoided the Thing, which crashed into a wall. Alexander discovered a transporter that took him to a blue key, and another transporter that returned him to the entrance of the labyrinth. Alexander used the blue key to open the northern gate. After a long a long climb Alexander reached Manannan's old study. The general picked up a large warhammer and then attacked Alexander. Alexander defeated him and took the warhammer for himself. He exited the study into the entrance hall, defeated a few more guards. He avoided upstairs since it was likely heavily guarded, and exited the front door.

In the Infamous Adventures, King's Quest 3 remake, a few months after Alexander made it back to Daventry, Mordack teleports into the house to retrieve his brother. He then burns the house to the ground.