Development of Doom
"Doom"s original release date was the third quarter of 1993, which the team did not meet. By December 1993, the team was working non-stop on the game, with several employees sleeping at the office; programmer Dave Taylor claimed that working on the game gave him such a rush that he would pass out from the intensity. Id began receiving calls from people interested in the game or angry that it had missed its planned release date, as hype for the game had been building online. At midnight on December 10, 1993, after working for 30 straight hours, the development team at id uploaded the first episode of the game to the internet, letting interested players distribute it for them. So many users were connected to the first network that they planned to upload the game to—the University of Wisconsin–Parkside FTP network—that even after the network administrator increased the number of connections while on the phone with Wilbur, id was unable to connect, forcing them to kick all other users off to allow id to upload the game. When the upload finished thirty minutes later, 10,000 people attempted to download the game at once, crashing the university's network. Within hours, other university networks were banning "Doom" multiplayer games, as a rush of players overwhelmed their systems.
Invader Zim merchandise
In 2003, Wal-Mart began selling a DVD compilation of Nickelodeon cartoons. As well as three other cartoons, the episode of Invader Zim "The Nightmare Begins" was included. Anime Works approached Nickelodeon with interest in Invader Zim DVDs and in June 2003, they put out a press release announcing that its anime division Pioneer will be producing three double DVD sets starting in Spring 2004 and a limited edition box set. As more information about the DVDs came out, it was revealed that Nickelodeon were approached by Anime Works with details of how there was a market for an Invader Zim DVD release, to which Nickelodeon responded by giving the go ahead. only region 1 DVDs have been released. Volume 1 can also be purchased on iTunes.  The Hollywood Video site lists 3 volumes, Invader ZIM: Vol 1 - Doom Doom Doom, Invader ZIM: Vol 2 - Progressive Stupidity And Invader ZIM: Vol 3 - Horrible Holiday Cheer, but these are sold in very few stores.