Spike manages to convince Julia to leave with him and put their past behind them once and for all. However, Vicious has other plans and he doesn't intend on letting them just walk away. Spike and Julia now find themselves facing the greatest danger they've ever faced and the stakes are their future, their happiness and their lives.
In the year 2071 humanity has colonized the entire Solar System through the use of 'Phase Difference Space Gates'.
A catastrophic accident occurred during the development of the Gates, damaging both the Earth and the Moon, heavily irradiating the surface, and forcing most of mankind to evacuate to other planets of the Solar System.
Wherever humanity goes, so goes its criminal element, and thus the need for those who hunt criminals. The newly formed solar system police reinstated the bounty scheme of the Wild West. Cowboy Bebop is the story of the four inhabitants of the spaceship Bebop, and the living they barely make at bounty hunting.