Okey, i watched the video and subscribed.
The super-speed has been described by his father in the series as ''pushing one self in the opposite of the desired direction'' if i remember it correctly. This makes me feel that viltrumites are capable of possibly reflecting gravity waves in their favor? Just speculation here, im not sure there is anything like that in the show. Anyway, travelling at the speed of plot has been a superhero stories mainstay since forever so as a GM i would just allow it.
Now for setting up a session in the Invincible verse i would be intersted, but the weird swerves of plot that do happen in the comic series(like the issues with Invincibles replacement who just.. killed his family.. that was weird) is something i would leave out of it. Now if it would be like meulating the tv series i would be for it. What could be the possible frameworks of such a session? Lets see:
Invincible War/The Other War, the players are Mark Graysons from alternate universes that have decided not to take part in the invasion. Plot twist, they are also evil just have diffrent goals.
Guardians of The Alternate Times, where the world is very different after Invincible has dissapeared after his fight with Angstrom Levy. The players are living in that world, they are what stands against its threats. And the world is not a good place. Dinosaurus has really ran unchecked and developed some horrible measures to create an utopia.
On the other side of the verse, a pair of viltrumites have taken opposite twin worlds as their charges. They try to stay out of each others way, sometimes they help each other, sometimes they fight. And the PCs are either the superhero members of those worlds or renegade viltrumites hiding amongst them. How will this situation develop?
After the events of the comics, the survivng Viltrumite violet hybrids have a choice to make. Some decide to stay on their planet, some are going to explore the universe. This seems like a good jumping point for a game. What lies beyond the event horizons?