To unlock this trophy, you need to play as Super Brainz on the Zombie side. You can do this against any plants, within any mode. It does not have to be against human opponents.
The Heroic Fist is used by pressing
. It is a strong melee attack that gets stronger with up to 3 hits.
Heroic Beam is performed by holding
to aim and then pressing
to fire. A beam will fire out at whatever you aim at. You can hold
to continuously fire until it overheats and briefly stops working.