Some Viltrumite scenarios

[Captain Smith]

The Viltrumites get the ability to wander the multiverse and want to take over, destroy:

1. They arrive at Planet Vegeta (before Frieza destroys it). They announce they will take it over. Saiyans being just as aggressive as them - resist

2. The DCU - Darkseid, having lost his army of Daxamites in the Great Darkness Saga, says to himself that here might be another army of 3 billion supertypes. Can he mind control them and start over?

3. The planet of the Valheru in the Feist Universe, when the Valheru are at full strength.

[Jcogginsa]

speaking to the Planet Vegeta scenario, it's entirely dependent on power level based scaling and where you'd peg Nappa compared to the average Viltrumite