"Scarface" charts the meteoric rise and catastrophic fall of Tony Montana. After arriving in Miami via the Mariel boatlift, Tony and his friend Manny secure green cards by assassinating a former Cuban official for drug lord Frank Lopez. Tony's ambition quickly outgrows his role as an underling. He orchestrates a deal with Bolivian cocaine supplier Alejandro Sosa behind Frank's back, which, along with his pursuit of Frank's girlfriend Elvira, leads Frank to order a hit on him. Tony survives, kills Frank, and takes over his empire, marrying Elvira and becoming Miami's top drug kingpin.
The second half of the film details Tony's descent into madness, fueled by cocaine addiction and paranoia. His marriage to Elvira disintegrates, and she leaves him. His overprotective obsession with his sister, Gina, alienates her. He gets arrested in a federal sting for tax evasion and money laundering. To avoid prison, he makes a deal with Sosa to assassinate a journalist. However, Tony refuses to detonate the car bomb when he sees the journalist's wife and children are in the car. This act of mercy dooms him; an enraged Sosa vows revenge.
The climax is a cascade of tragedy. Tony returns to Miami to find Gina with Manny. In a blind, coked-up rage, he shoots and kills his best friend. A distraught Gina reveals they had just gotten married and wanted to surprise him. As Tony wallows in guilt, Sosa's army of assassins storms his mansion. A vengeful Gina shoots at Tony before being killed by one of the hitmen. This triggers Tony's legendary last stand. After snorting a mountain of cocaine, he famously introduces his "little friend" (an M16 with a grenade launcher) and single-handedly kills dozens of attackers before being shot in the back by an assassin with a shotgun. His body falls into the fountain below his "The World Is Yours" statue, a final, ironic image of his complete and utter ruin.