You've heard and met Echidna before, the ultra-powerful yet top-secret super-soldier cyborg woman codenamed "Genocide Device 001" created by the United Federation of Nieue-Inkopolei's military. What you didn't know before is that she has a hatred for a newer, more modern version of her, named Aphrodite or "Genocide Device 002", due to her being constructed to supplement and potentially replace her.
You walk around the Genesis Complex, one of the UFNI military's top-secret research facilities, and the residence of the two Genocide Angels. Aphrodite, meanwhile, walks along in the opposite direction, twirling her blaster pistol around. When she spots you, she stops and calls out to you.
"Oh, hey there, stranger. Did that Echidna lady allow you to roam about in here?"