ALIEN: COVENANT is a prequel to the original ALIEN movie and a sequel to ALIEN: PROMETHEUS. Some who saw PROMETHEUS wanted a sequel to explain what they had just watched in the train wreck that was PROMETHEUS. Those people had to be disappointed in what was given to them.
A group of colonists are on their way to settle a new planet. The journey is interrupted when an accident causes the ship to have difficulties in which the crew is needed. After waking most of the crew successfully, Walter (the new android), tells them what happened, how many crew members were lost, and how many colonists were lost. While on the outside fixing the solar wing one of the crew members experiences a disruption in their system. Later they find that what they are hearing is in a popular song from earth, so they decide that they need to look into where it is coming from. They find that the transmission is coming from a planet that might just be a good one to settle on, so the captain decides they must check it out, much to the chagrin of his second in command.
Once they get to the planet everything that can go wrong does, and when the survivors are finally back on the ship and ready to settle in again for the rest of the trip to the new planet they find that things aren't over, which seems to lead to another prequel to the original ALIEN movie.
Now, what did I think about this movie? I think it did not need to be made, and I don't feel like it adds anything to the ALIEN franchise. Not only were there several plot holes in this movie, but there was a lot of information that was changed throughout. For example, they kept saying that there were 2,000 colonists on the ship, even though there were a few whom were lost during the original incident which woke up some of the crew members. This became annoying throughout the movie as it was not the only thing that was inconsistent.
The only character who was at all interesting in the movie was the Android, played by Michael Fassbender, however, even he was annoying and inconsistent. This movie was full of idiotic moves that are tropes of horror movies, and the audience is really tired of these tropes. One of the things that was a blatant sign of laziness was the actions of the characters. People are being killed and one by one they walk off, which leads anyone watching to think what... well, they are dead, and SPOILER... they did die. All of the actions you expect in a horror movie, they happened in ALIEN: COVENANT.
People make stupid decisions that get them killed: Check.
People walk off on their own and get killed: Check.
People get sick and think that they can save the sick person: Check.
People die because they want to save the sick person: Check.
People die because they trust a stranger: Check.
People trust the stranger who tells them to look at something, which in turn kills them: Check.
People believe that the copy of what they trusted is actually the one they trusted, which gets them killed: Check.
People don't question anything that is going on, which kills them: Check.
The twist is exactly what you think it will be: Check.
So this movie was entirely predictable and unnecessary. I don't understand why anyone feels the need to go back and explain the beginnings of the alien creature. The new versions of things don't add as much to the story as they should, and the Engineers are just useless int he evolution of the alien creature. Lastly, there was at least one scene which tried to explain some things, and not only was it incomplete, but it didn't even explain itself.
So, will there be another Alien move, probably. Will I watch it, probably. Will it be any good, oh god I really don't think so. I think they should have stopped trying when they added Winona Ryder as an android, because she was just not good.