Aged Arthur is abused and treated like a dog by his daughter Lily and son‑in‑law David, with only his granddaughter Mia showing him kindness. On his birthday, a lottery ticket Mia buys grants Arthur a $50‑billion jackpot.
Instead of exposing his wealth, Arthur buys David’s prized Apex Group and works undercover as a night janitor to play a calculated cat‑and‑mouse game. Aided by his assistant Elena, Arthur humiliates David: stripping his promotion, making him clean toilets, exposing his theft, forcing him to eat trash and compete in savage underground octagon fights.
The corrupt pair tries to drug Arthur for his fortune. David then conspires with a hacker for extortion, only to be double‑crossed and robbed of everything. About to lose their home, they kidnap Mia for ransom. Arthur closes in with armed guards and mercenaries, reveals his real identity, and sends the couple to federal prison for 30 years.
Arthur settles on a private island with Mia, until his runaway, embezzling eldest son Richard arrives. The first season ends on a high‑stakes cliff‑hanger, as infrared sights from dozens of assault rifles zero in on Richard.
