Recently i've been playing a lot of Mass Effect & rewatching Stargate & i started thinking: what sci-fi would be good mashup? Lets assume here that everything works even in mashup as it does in show- say you use SG technology, it follows SG rules, use ME technology, it follows ME rules (only on supposed conflicts).
Also, how would good guys bear against other franchises bad guys- for example, would Stargate universe's (i mean universe itself, not lousy spinoff) technology be a match for the reapers (Mass Effect) and if so, which races? Same other way around: how powerful would goa'uld or Ori or even wraith be in Mass Effect universe, considering there are a lot of spacefaring species in ME (turians, salarians, asari)

What do you think would make interesting mashup