At the end of Prometheus, we saw that a creature was born from the body of the dead Engineer which was essentially identical to the Alien creature pictured the Alien vs. Predator movies (a Xenomorph). ...
If X-Men First Class (XFC) is based before X-Men Origins (XMO) then how did Emma Frost end up being captured by Colonel Stryker? The last we see of Emma Frost in XFC she is with Magneto and Raven, ...
Is it ever made clear officially what the timeline of the Marvel Cinematic Universe is and where Agents of S.H.I.E.L.D falls on it?