Mutalisk Evolution: Brood Lord and Viper (Starcraft 2: Heart of the Swarm)

The brood lord strain was re-inducted into the Swarm after the Swarm's mutalisks killed some feral brood lords and assimilated their essence. The mutalisks were then morphed into new brood lords which Kerrigan then sent to destroy the nearby Dominion defense platform Sigma Centari. The viper strain was developed from primal zerg essence. Several vipers were used to steal jorium crystals from the Dominion on Brokas Hur... "Mutalisk Evolution" mission from 'Starcraft 2: Heart of the Swarm' PC game... Gameplay on Normal... ► Watch more Starcraft videos: bit.ly/1b1W2yY.
Mutalisk Evolution:
Brood lord strain: Can morph into a brood lord, which besieges ground targets from long range with spawned broodlings.
Viper strain: Can morph into a viper, which can pull distant units close, slow enemy ground units and prevent them from attacking for several seconds, or drain life from allied units to restore its own energy. Also enables air-to-air combat.