Taylor is dead, Marlow brought the alien on board the Sevastopol, from the Nostromos crash site and then homed in onto that delorant jaggurnaut ship. They thought they’ll make it big. It was the Alien, that’s now here. Weyland I think is still wanting to bring that thing to Earth. They’ve been compromised by these Aliens I think. It is a very hostile species. Mom is in the escape module, in deep space in hyper sleep. We have to save her I guess.