The second part tells the source of the virus: when Dr. XXX's daughter was sickly and unable to support, the doctor who was eager to save her invented a medicine that could enhance people's physique, and then her daughter recovered. The film doesn't explain the relationship between doctors and companies, but it's simple to understand: companies know about the existence of this drug, recruit doctors and try to study a new drug, which can greatly increase people's physique. And can have supernatural vitality, but it failed. There is only one successful example, the heroine. From the ability of the third heroine NB, we can know what is the perfect drug effect. The side effect of failure is those zombies. So the company has been studying how to turn this virus into a perfect drug. So there was the first episode: the virus leaked. Episode 2: External infection. Episode 3: Global Infection. The fourth episode: female.
What is the relationship between companies in such a social environment? It's the boss. Umbrella company should be an international company with a lot of wealth and private armed forces. The research on the virus is confidential, so the whole world is infected, and there is no prevention. Only the umbrella company knows that the virus has leaked out. As can be seen from the second episode, civilians are not allowed to leave the city, ostensibly to prevent the virus from leaking out, but in fact it is an excuse to kill people. Finally, the bombing of cities with nuclear bombs is the best proof. So the whole world was infected and turned into zombies, but umbrella company didn't. Imagine that in a world full of zombies, companies with guns, guns and armies are not the owners of the earth. Please refer to companies of the opposite sex. They will do whatever it takes to study chemical and biological weapons, which is very powerful.
The BOSS in the fourth episode is not the final BOSS. Just a person in charge of the company. This company is so huge that even the whole world can see satellites. Leaders are naturally shareholders of the company. These shareholders appeared in the third episode and were having a teleconference. The earth was destroyed, but the company's research on the virus did not stop. They still wanted to develop this perfect drug.
I think it is necessary to act in the fifth film. The last BOSS, I think, must be a human rather than a zombie. The company finally developed this medicine, and some people took it and became as powerful as the heroine. This power is different from the first four episodes. They are monsters, not human beings, and even the perfect drugs only enhance people's functions and will not turn people into zombies. I think this drug can even prolong their lives, maybe. ...
Isn't Andrea and umbrella the same thing? If not, I don't know.
By the way ... I don't know what to say in the fourth episode ... Because there are so few scenes of zombies fighting, who is interested in seeing a foreign 38-year-old flying plane ... In the fifth episode, I guess those planes finally took the protagonist back to the company headquarters, and then extracted blood and studied drugs. Finally, BOSS appeared, and with the support of the heroine's clone in the third episode, he fought with the protagonist Bosshshit, and used BOSS NDA to combine with his own DNA. I have developed an antidote to cure zombies, or the zombies are all dead, and the earth people climb out of the hole to rebuild the earth. If the fifth episode didn't have a happy ending, I wouldn't watch the sixth episode even if I paid for it.