First Contact Effect

[Halcyon]

The Plot Gods decree that the following realities are now one shared universe.

Babylon 5. After the 'death of Sheridan' in the Corianna System. Delenn is still president of the ISA and Ivanova is Ranger One.

Mass Effect shortly after the Collectors destroy the 1st Normandy.

Star Trek: Enterprise. After the Federation is created.

All the major races/factions and homeworlds are present so the Galaxy has grown in size
to include the duplicates of the worlds in the Sol system and the regions claimed by the various races including the region that was once held by the Vorlon Empire. The Jump gate network is now present.

What happens? How do the Reapers react to the presence of species with totally unfamiliar technologies? What do the Citadel Council do in response to two organisations that rival them in power? How do Cereberus react? What happens when Delenn & Ivanova find out about Shepard's warnings about the Reapers?