In this scenario the ROB being bored decides to have a little fun at the expense of some poor universes. He takes a Zentraedi Fleet (Macross) consisting of 4 Million Warships and several Billion Zentaedi and sends them to these universes.
1: Star Trek Circa 2411 AD
2: Star Wars Circa A New Hope
3: Babylon 5 Circa The War with the Shadows
4: Warhammer 40K. Just pick a point in time it is all Grim Derp
5: Stargate SG1: Circa season 6
6: Gundam Wing Circa the beginning of the series
7: Gundam Seed Circa the beginning of the series
8: Aliens/ Predator Universe circa Aliens movie
9: Hasbro Universe (G1 Transformers, GIJOE, Inhumanoids, Gem etc)
10: Insert your favorite universe here.
The Zentraedi will not show up at a home world with the bulk of their main fleet. They will send smaller Battlegroups of about 100 ships to scout out the location before the main fleet moves into a Star System. They like all Zentraedi are vulnerable to Cultural Contamination. But it is not a 100 percent effect. Some Zentraedi might decide to go Native but most won't. So how does each universe deal with the Zentraedi arrival?