A fictional [[walker (robot)|]] combat [[mecha]].

The [b]Mad Cat[/b] is a Clan OmniMech from the [i][[BattleTech]][/i] game setting. 

Properly known as a [i]Timber Wolf[/i], it was nicknamed [i]Mad Cat[/i] in its initial fictional appearances because it was first seen within the story by Inner Sphere MechWarriors, who were unaware of the existence of the Clans or their advanced 'Mechs until that point and didn't know the enemy units' proper names. 

Those who survived the initial encounters dubbed this model [i]Mad Cat[/i] because it resembles an earlier [i]Catapult[/i] BattleMech with the arms of a [i]Marauder[/i] (manufacturer designation MAD-3R).
mad cat (battletech)