Nick is a dockworker in the Port of Baltimore, and works for his uncle Frank Sobotka, the secretary treasurer for a stevedores union. He often has to keep his cousin Ziggy out of trouble, a fact his uncle appreciates. Despite his disdain for Ziggy's antics, Nick shows considerable patience and seems to genuinely care about him. Involved in his uncle's smuggling operation, Nick often serves as Frank's go-between in meetings with Spiros "Vondas" Vondopoulos. At the diner Vondas uses as an office, Nick acquires the serial numbers of cargo containers being smuggled in by The Greek. Nick has a girlfriend, Aimee, with whom he has a daughter, Ashley. They want to move in together, but are unable to afford a place of their own. The fact that Nick lives with his parents and lacks a steady income leads to tension between the two. Since Nick is one of the younger stevedores, seniority prevents him from getting enough work at the docks. Desperate for cash, he and Ziggy steal a trailer full of cameras and sell it to the Greek's front man, Glekas. This brings Nick to the attention of Vondas, who asks for large quantities of chemicals. Nick accepts this job after learning that the chemicals are used in the processing of drugs instead of bombs. Nick enters the drug trade to help relieve Ziggy from the debt he owes to Proposition Joe's nephew Cheese. Cheese cooperates when Nick arrives with Sergei "Serge" Malatov to threaten him at gunpoint. Later, Nick sells heroin to a drug dealer named Frog after receiving it as payment from Vondas. Nick begins dealing with "White" Mike McArdle in order to continue supplying Frog. Nick is distraught when Ziggy is arrested for killing Glekas. Knowing that Ziggy's stature and temperament make him ill-suited for prison, Nick descends into a drunken depression and tearfully laments the circumstances that landed Ziggy behind bars. Eventually, police obtain a warrant for Nick's arrest. His parents are aghast to see Nick's stash of money and drugs when their house is raided. Knowing about Ziggy's case, the Greeks make an offer of witness intimidation in hopes of buying Frank's silence. Nick relays this offer, prompting Frank to arrange a meeting with the Greeks alone. From their mole in the FBI, the Greeks learn that Frank cannot be trusted and kill him once he arrives. Grieving over his uncle's death, Nick turns himself in to the police in order to testify and help them identify the Greek for the first time. At the end of season two, Nick, Aimee and Ashley enter federal witness protection. In the last scene, he sheds a tear looking at the decaying shipping shoreline, symbolizing the death of blue-collarwork in American industry.
Season 5
Nick makes a brief appearance in season five, heckling Mayor Tommy Carcetti’s ribbon-cutting ceremony for the conversion of a derelict grain pier into condos and waterfront commercial space, contrary to what his uncle Frank had hoped. This, together with the appearance of Johnny Fifty in a homeless encampment earlier in the season, suggests that the port has been continuing job cuts since season two. No information about Nick's life is provided, although Simon has since said that Nick left the witness protection program after missing his friends and family.
