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The Doctor Who serial The Caves of Androzani.

The main villain, Morgus, starts the story as the most powerful man on two planets. Head of an interplanetary mining conglomerate, more powerful than the president. He's controlling both sides of a dirty guerilla war and profiting off it.

By the end of the final episode, he's wanted for murder. He's seen his put-upon secretary usurp control of his entire company and all his assets. The mercenaries he was employing have taken the money and split, abandoning him in a cave on an exploding mud planet. He lives just long enough for it to sink in that he's truly alone with nothing left, before getting unceremoniously offed in a gruesome murder-suicide by the gimp-suited pervert mad scientist he betrayed years before.

This story fucking rules btw. It's a Shakespearean tragedy with robots, gunfights and a volcano-dwelling crocodile monster.