Ok. Here is your more in depth answer.
In the time between alien and aliens, or the time between aliens and alien 3, of marine encounters with aliens. It would be somwhat like aliens, but the marines would just be a group of security guard replacments. Scientists are attemting to breed aliens, in order to study them, and one of them falls asleep/ gets drunk, and somehow releases the aliens. Possible ways include:
1) a promt to vent the heat for a certain ammount of time appears on the computer screen infront of the sleeping scientist, who was supposed to be the one reprogramming the defualt venting time, because they were working on some other project befor that worked/failed. The aliens climb out of the cage area throught the vents.
2) In a drunken slumber, he hits the cage realese button.
The aliens escape and then reak havoc upon the scientists and marines. Naturally the scientists are captured first. A dramatic, slow, creepy and suspensfull escape towards the escape pods, The camera view from a marine. It's shown from the soonest to die marines head cam. after the he dies, it goes to the next soonest to die marine. After there are only three marines left, Jenkins, Audry, and Frank are in the escape pod. They realise that the ship wont blow up, unless it gets shot out of orbit, and Frank has to choose between his life long friend, Jenkins, or his girlfriend, Audry. Here the camera goes to his head cam. He decides to go alone, and makes his long way to the controll room. After sets the core to critical, he goes onto a warpath back to the pod, killing loads of aliens, some giger drones, some warriors, some Rez (Alien ressurection) aliens and reaches the shuttel. they leave the reseach station, on course to earths capital city, and watch the ship turn into a firey hell hole of death. they need not go into hyper sleep, and then spen a while talking. Suddenly, a tio of face huggers attack and they are all impregnated...
Fun facts:
The space ship thrusters wont be going constantly, as they wouldnt need to, for in soace, there is no friction to slow you down.