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A horde of Batty and Sparky viruses.

A Virus (ウィルス?) is a malicious or corrupted program that disrupt the operating system or cyber network of electronic devices. Viruses are encountered as enemies in the Mega Man Battle Network series, found randomly across the cyberspace, searching for NetNavis and other programs to delete. A NetNavi must have basic Virus Busting abilities to navigate safely on the net, otherwise its actions will be limited. Viruses may leave Battle Chip data upon deletion, the chip depending on the virus, and related to the attack that the virus uses.


While viruses are often wild, some are man-made. They can be created to guard important data or switches. Villains often use viruses to trap data in an attempt to delete (or at least stall) Navis that may be trying to stop them. They are also commonly used by villains to shut down machinery.

Some Navis are capable of calling viruses for use in battle. A good example is MagicMan in the first Mega Man Battle Network, but also HeelNavis commonly use viruses to attack their opponents (although they often use viruses to do all of their fighting, some that fight in battle themselves are capable of calling viruses mid-battle).

In Mega Man Battle Network 3, MegaMan is capable of calling a virus to launch an attack against an enemy. Rush is also capable of calling viruses in battle.

In the anime, some Battle Chips can summon a virus to execute an attack. For example: Cannon chips are used to summon independent Canodumb viruses controlled by the operator, Condor summons a Fishy3 to ride on, IceBall can summon a ColdHead that fires a frozen cannonball, and Trident summons a Piranha to fire a trident spear.

Virus Lists

The following are lists of viruses from almost every Mega Man Battle Network installment.

See also

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