Catack (キャタック Kyatakku?) is a virus in the Mega Man Battle Network series that resemble a tank operated by a small shady figure. They appear in Mega Man Battle Network 5 and 6. Catacks slowly advance forwards one panel at a time. Each time they move forward, they will stop and fire their cannon. The blast will push the target back if it is hit, but if this goes uninterrupted, the blast will engulf the left-most column on the target's side. Once Catack reaches the target's side of the field, they will capture any panels they touch, but will stop advancing once they've reached the middle column. If two Catacks are present in battle, both will advance simultaneously, but only one will fire at a time.