With the world in the balance, Mark must fight a Viltrumite to save the planet. But can he take down the alien invader alone? This is the Season 3 Finale.

After the Invincible War in season 3 episode 7, this week's episode upped the ante as Steven Yeun's Mark Grayson faced off against Jeffrey Dean Morgan's Conquest (among other things), and fans are saying it's a highlight of not just the season, but the show – and animation – more generally.