Dossier: The Veteran

The Illusive Man, Cerberus mysterious leader, has asked Commander Shepard (as part of providing a list of potential recruits for Shepard's team) to travel to Omega, in order to pick up the infamous mercenary Zaeed Massani, with whom he has made an arrangement in order to recruit him (this mission and character are part of Cerberus Network initial DLC).

Plot
Upon arriving on Omega, Shepard should almost immediately run into Zaeed, who is brutalizing a prisoner. After a short dialog (multiple options regarding his attitude with the prisoner), he will propose, in fulfillment of his arrangement with the Illusive Man, to board the Normandy and wait you there, until you can talk further.