Full realization of doors.
The Great Scottland Door Infestation occurs in Episode 394 - Breaking All the Rules, in conjunction with The Great Scottland Squid Infestation.
In the beginning of the episode Zack notices a trail of doors just outside the Gay Bathhouse. Leaving, he finds that the entire Lobby area has been filled with doors.
Brett reveals that he was the one to place the doors, stating that "Someone on the wiki said that spawn didn't have enough doors."
Glimpse of the door before iWolffy blows up the fireplace