The Mass Effect series as a whole feels very Star Trek to me. However, time travel is something that exists in Star Trek, but so far has been absent from Mass Effect. Do you guys think a time travel story could work in the universe that BioWare has created, or is it totally out of the question?

Worm Holes spit you out at a random place and time, so if they flied into one maybe.

Well if they stick to the hard science fiction they were trying to get in the first one, no.  If they want to makes the Reapers some sort of magic entities that create big space babies, then yes.

I think it could work. Time travel as a story device can be a little too "deus ex machina" for me, but if done well I really appreciate it. I trust BioWare with this sorta thing, so if they did do it I think they could do it well.

Even the phrase "time travel" makes me laugh a bit.  
 
I feel like the tone of the games prevents them from going that direction. Mass Effect is much more Star Wars than it is Star Trek. More space opera than anything else. 

No

Time travel always has been the ultimate cop-out plot device to me, plus it essentially confirms and legitimizes pre-destination/prophecy junk in stories which writers are fond of recycling a lot.
The only time travel that I can agree with is traveling forward and witnessing societal change due to something like cyrostasis or regeneration (which is the plot to ME2, Shepherd spends 2 years in death).

Timetravel is a rather complex thing to integrate into a story perfect, they had 2 games so far with 1 left to go.
It's hard for me to imagine them doing anything time travel related now as there is hardly any reason for it and it would come out of the nowhere.
 
So I spend years getting the universe ready, assembling my team, gathering allies, died and resurrected once, just to hear that whatever I did is not enough and I need to go back to the future (or past) to save the universe? Mood killer is what I think.

" Well if they stick to the hard science fiction they were trying to get in the first one, no.  If they want to makes the Reapers some sort of magic entities that create big space babies, then yes. "

" Well if they stick to the hard science fiction they were trying to get in the first one, no.  If they want to makes the Reapers some sort of magic entities that create big space babies, then yes. "

The first contact war would be cool. I think it was against the Turians.

" The first contact war would be cool. I think it was against the Turians. "

NO. For the love of Nielsen, NO! Also, no teleporters either. 

It's not needed, Shepards time is almost up, after that they can set the games when and where they please.

yea. I don't really want to see time-travel in ME, even though it is pretty advanced shit, the world feels sort of grounded, like there is a reality there, but timetravel would just break that illusion, things wouldn't really have the same impact and everything could get fucked up. And yea, after ME3, Shepard's story is presumably finished, so they can set games anywhere and time in the ME universe (and even before ME3 is finished, if they rumours about the ME game being announced at the VGA's mean anything).

" Timetravel is a rather complex thing to integrate into a story perfect, they had 2 games so far with 1 left to go. It's hard for me to imagine them doing anything time travel related now as there is hardly any reason for it and it would come out of the nowhere.  So I spend years getting the universe ready, assembling my team, gathering allies, died and resurrected once, just to hear that whatever I did is not enough and I need to go back to the future (or past) to save the universe? Mood killer is what I think. "