SJ and Engineer two different species?

One Engineer is undoubtedly around when they release the laser mapping device. What the crew mutates into is anybody's guess.

The SJ could be just a one-size-fits-all environment suit that allows the wearer to either control the ship, or survive the journey. That's why the SJ in Alien was bigger, a larger creature is wearing the damn thing.

I don't think they are mutated crew either. And the SJ vs. Engineer war is a valid possibility too that I never thought of. Maybe like In The Mountains of Madness the workers/slaves have turned on their masters and destroyed them. Maybe the SJs are malevolent, the Engineers less so (which also speaks to the idea others have add that the Engineer is not going to attack David in the map room, but is working with him towards some goal). Maybe the Engineers have a common goal to stop a surviving SJ from lifting off and going to Earth.. However, I hold firm to the belief that the SJ and chair in Prometheus are not the same ones in Alien.

Did anyone stop to think that maybe humans just got smaller by the time we found SJ in the Alien ship? Maybe Sir Weyland shrank us all so we would consume less of the world's natural resources....

If you have a look in the media section youll see our leading lady looking at something off camera with a tunnel (not made of bones like it should be) behind her, there are 2 suits or Sj behind her on some kind of small platform. Perhaps the suits themselves create the Sj.

"leaving the engineer behind as he waves at it." i dont think hes waving i think hes examining the infection across his body, which i think is one of the prometheus crew likely holloway... "the straps are moving away from him, seemingly, releasing him." watch that part again i think they are strapping him in, as one of the shots before this he is walking towards it....so likely that the blue giant is a SJ and hes getting into the SJ suit. Also Ridley scott has always said he wants to tell 'his' story, so i dont think he would seperate a glimps of a character for 30 years ago into two differnt species at war with eachother, when they is already alot of blanks in the mythology to fill in. "However, I hold firm to the belief that the SJ and chair in Prometheus are not the same ones in Alien." i'm unsure about this Beihn_Bandit, as in the trailer i think we are shown 2 derelict horshoe ships, one that appears to blow up, and one that crashes, either that or it is a very sturdy vessel which crashes, but i still think that it is the same one... which would mean that there are aliens on board somewhere, maybe....

Maybe the ampules or "eggs" are the "engineer species" themselves. Maybe they are just some kind of genetic intelligence goo that needs other life to grow and form.

So the engineers store their own essence (or something) in the ampules, and create biomechanical SJ's to 'take care' of them during space flight, the way we create androids to take care of our needs. Their androids can go bad just like ours and maybe theirs have higher aspirations like ours as well, which creates problems for all of us when our slave/servants rise up.

2 ships ........... One of them takes off and crashes back onto the planet ............ the other ends up crashing into LV-426. HMMMMMMMMM

No matter if they aren't mutated crew mates they will end up being or maybe not but i know something is very very wrong with holloway so just remember that

I think everyone is missing the point. I saw the original Alien 33 years ago and I've been waiting for answers to the Space Jockey ever since. This movie is about the SJ(s) and their relationship to man. If you recall, in the original Alien, Ripley deciphers the beacon transmission from the derelict ship as a warning, not an S.O.S. If the SJ set the warning beacon for all sentient life to stay away from his "infected" ship, then it logically follows that SJ is a benign creature. SJ may or may not be the originator of the xenomorphs, but is definitely a victim to it. Weyland-Yutani had prior knowledge of the signal, the derelict ship and LV-426. Recall, that Weyland-Yutani wanted a living specimen for possible bio-warfare use. Jump to Prometheus, where the ending scene in the new trailer has David, the android, saying: "Big things have small beginnings.." I believe he is referring to the tiny, wiggly, creepy worm-like lifeform that appears to enter the humans through their eyes. These are bio-morphing creatures that either genetically rewrite DNA or symbiotically fuse with their host - progenitors to the xenomorph life cycle. I think at the end of the movie we'll either see our orignal xenomorph or the path will be established for that species. What is left is the question of the Engineers. Are they good or evil. Are they the SJs or were the SJs the workers who carried out the orders or plans of the Engineers. Since, in the original Alien, it was established clearly that the decomposing body of the SJ resembled an elephant-like trunk on the face of the SJ, the spacesuit debate doesn't hold water. Here is my theory. Both the Engineers and the SJs are benign creatures. Engineers are human-like, thus the big head in the temple, and they are the brains and literally the creators of worlds. The SJs are the workers who implement the plans of the Engineers when it comes to terraforming and seeding planets with life. The wildcard is the humans, who somehow screw things up and unleash the bio-morph, worm creature in a bad way. The worm infects the humans, changes them and I think the humans then become the predecessors or parents to the xenomorphs. The two most powerful human instincts tranfer to the new, xenomorph lifeforms: Violence and Pro-creation - the need to kill and the need to breed. I can't wait to have these loose knots tied up after 33 years, even if everything I've said is wrong. I hope Ridley Scott delivers a satisfying and mind-blowing sci-fi saga in the tradition of Alien and Bladerunner. Cool special effects not withstanding.

Yes, I think they are 2 different species. In the original Alien movie, it was established that the SJ was a giant, elephant-trunk looking creature. Yet, in the temple scene, the giant carving of a head is fully humanoid. I think the Engineers develop the DNA and the means to terraforming and seeding planets. The SJs probably carry out the plan. Earth and humans were genetically engineered. The wiggling, worm-like creature is either a bio-morph that enters the host and rearranges the DNA or it carries new DNA to be used in the host to synthesize a new life form. Either way, the humans screw things up in a bad way and the worm is probably going to synthesize the Xenomorph from humans. Are the Engineers benign or malevolent. Great question and the movie will answer that. There is probably some sort of ironic twist that will catch us off guard, like we are the Engineers - except it's a future or past self of us. It'll have a Bladerunner like ending where Roy, the killer, saves Deckard's life in the "death scene". I also think that the derelict craft from the orignal Alien movie is the craft in this movie. The opening scene of the new trailer with the human looking at the hand with the strange markings is either Shaw or Holloway. The infection from the worm is transforming them, but what planet are they on? Is it primoridial Earth or another planet, which the Engineers are terraforming and seeding it with the infected humans. I'm going to see this movie many times when it comes out.