During the use of Bliss onboard one of the Motherships hovering over Earth, a member of the Fifth Column intended to spirit his mate away from the event. However, she was completely immersed in the experience and the Fifth Columnist decided that he could not be apart from her. With that said, he activated a grenade device which exploded and killed him, his mate along with the group of Visitors in its blast radius. Marcus reported the incident to Visitor High Commander Anna who decided to take steps at combating the Fifth Column. (Pound of Flesh)
When FBI Agent Erica Evans came onboard the New York Mothership, she did so with the secret intention of killing Anna's army of Soldier eggs that were waiting to be hatched. Whilst sneaking away from a dinner with Anna, she met Lisa who gave Erica a blue energy grenade for use against the unborn army. (Red Sky)
Behind the ScenesEdit
The grenade is not named in its initial appearance but in the Season 1 finale, its given the name of a Blue energy grenade.