Z2-47 is an Institute Courser, designed for high-risk assault and retrieval operations above ground. During 2287, he is tasked with retrieving a Gen 3 synth; designation K1-98. K1 however was captured by a group of Gunners and taken to their base at Greenetech Genetics, but this did not stop the ruthless Courser as he charged into the facility; killing a large number of Gunners in his way until he reached the synth - but before he can get her, he meets his final foe; the Sole Survivor.
If one opens the security door before engaging Z2-47, he will thank the player character and ask for a moment before using the recall code. From here he engages the player character in dialogue beginning with, "Are you here for the synth?" exactly the same as if K1-98 had not been freed prior to engagement.