Thundergun

The Thundergun is a weapon featured in the Dead Ops Arcade and zombie mode of Call of Duty: Black Ops, and can be found via an easter egg in the campaign mission "Numbers".

Background
The Thundergun is a cannon-shaped weapon that fires directional blasts of incredibly strong wind, essentially an extremely powerful shotgun. It has no Iron Sight. It appears to be able to kill large numbers of zombies with a single shot, sending them flying backwards. Those who are not killed by the wind blast are thrown backwards. The Thundergun holds two rounds in a magazine, and holds twelve reserve rounds. Its Pack-a-Punched form is called the "Zeus Cannon," it has an increased magazine size of 4 and carries 24 reserve rounds. It has increased damage, range and radius, now knocking over and slightly damaging zombies off screen. The Thundergun is most important during the later rounds as it is useful for clearing large groups of zombies in order to reach a downed teammate or make an escape.

It is often used as a reserve weapon, as it has a low amount of ammunition and has a slow reload.

Campaign
The Thundergun appears on the level "Numbers" as an easter egg similar to the Ray Gun on "Little Resistance." The steps and video on how to do it are as follows:
 * 1) After the Interrogation scene ends there are six canisters to the front of the player.
 * 2) Shoot all six canisters until smoke comes out.
 * 3) Run back to Weaver and Clarke and make a left to the desk.
 * 4) If done correctly the player will see a black tape sticking out of a cassette player.
 * 5) Hold down the action key and the tape will disappear from the cassette player, or the obvious shake in the screen as cue.
 * 6) Continue on until you get to the first of Clarke's weapon caches, behind the fridge after the rooftop jump
 * 7) Look at the left and you should find a cassette player
 * 8) When at the cassette player press the use button and notice the cassette go in.
 * 9) If done correctly notice the tape goes in and the player makes several tunes, and the game shakes.
 * 10) The Thundergun will appear out of the wall.

The gun found in Numbers comes with 2 shots in the magazine and 12 shots in reserve. It also gains a full ammunition refill after sliding down the pipe and at the second weapons cache, because of this it becomes very useful when playing on Veteran. In essence, it works much like an extremely powerful shotgun, throwing and almost always instantly killing anyone caught in its massive spread, often with enough force to tear off limbs.

300pxHow to get the Thundergun in "Numbers"

Video
400pxthumb|right|378px|The Thundergun is also on the wii version

The Thunder Gun in action

Trivia

 * This is not a usable gun on "Five", probably because players could easily take out the thief with it.
 * The "Zeus Cannon" is an obvious reference to the Greek god, Zeus.
 * The Thundergun is the only Wonder Weapon, when upgraded, that doesn't keep part of it's name. (e.g. Wunderwaffe DG-3 JZ, Porter's X2 Ray Gun, Winter's Fury)
 * The gun has "Osterezheniye" written on its side, which is incorrect Russian translation of "Warning."
 * The thundergun in Numbers is also available on the Wii version.
 * If some zombies are not hit directly with the wind, it is possible to see them get back up slowly.
 * This weapon also has no iron sights and must be hip fired.
 * The two red glows on the front of the canister when loaded indicate how many shots are left in the magazine.
 * In Zombies mode, you cannot reload the Thunder Gun unless the entire clip is empty; howver, the PC version you can allows you to do this.
 * Richtofen states that this weapon was invented by Ludvig Maxis, but was deliberately hidden from him. This may be a generalization to the whole of group 935, but if true this is the third wonder weapon to have an associated character, similar to the Wunderwaffe DG-2 and the Monkey Bomb.
 * Only one person can have the Thundergun at a time. However if the player who has the Thundergun upgrade it to the Zeus Cannon, the Thundergun is once again possible to achieve from the Mystery Box.
 * In Kino der Toten, when Richtofen gets the Thundergun out of the mystery box he says, "Could it be? The DG-3!" despite the upgraded Wunderwaffe DG-2 being called the Wunderwaffe DG-3 JZ.
 * When you tactically reload in the mission "Numbers" the magazine seems to just disappear from the gun rather than taking it out.
 * If you look behind the second tape player in "Numbers" there is a white outline of a electric bolt with an arrow on top. This likely references the Thundergun, as it points to directly where it will appear.
 * The Thundergun and the Ray Gun are the only Wonder Weapons that can be found in campaign. Also note these are the only two Wonder Weapons to have an official pick-up icon.
 * In a book by Rudolf Lusar called The German Weapons and Secret Weapons of World War Two and Their Development, a weapon very similar to this one is described. It was said to shatter wooden boards at a range of 200 yards by using jets of compressed air. It was also ready to use at an engagement at a bridge over the Elbe in 1945, but was not actually used.
 * When the black cassette tape is inserted into the second recorder, some sounds from GKNOVA6 play.
 * This gun in "Numbers", unlike the ray gun in "Little Resistance", cannot be picked up more than once for unlimited ammo.
 * Sometimes when using this gun on the campaign, if you hit a Russian occasionally a zombie scream can be heard.
 * Thungergun deals no friendly fire damage in "Numbers", saving you from accident civilian kill.
 * The Thundergun has been known to rip body parts off of Russians, in the Campaign, instead of launching them backwards.
 * There is an unusable Thundergun in a metal locker in Five. It is in the same room as the unusable Winter's Howl and Death Machine.
 * Killing zombies with the Thundergun can result in the dead zombies twitching on other peoples screens, as if they are still alive.
 * The Thundergun is often referred to as the DG-3 or the DG-4
 * The "Thunder Gun" is a great gun to use on solo.. because its ability to kill more than 3 zombies at a time.

Inconsistency
Although Richtofen refers to the Thundergun as possibly being the DG-3, the pack-a-punched version of the DG-2 is known as the DG-3 JZ. However, since Richtofen stated the gun was deliberately hidden from him, he may not know what the Thundergun is really called. It also has Russian writing on it, although Group 935 -- the group which made the Thundergun -- was a Nazi organization, although, considering Dr. Steiner and Dragovich worked together in the campaign, it is not without plausibility that the Thundergun was a co-operative project, or that the Russians stole it. This inconsistency may potentially be because the Pack-A-Punched weapons do not have 'official' names in real life, and so the displayed names are 'nicknames' for the weapons given by the characters, or that the names are not canon.