That's an absolutely stacked voice cast, but there'll be many more characters to meet in season 4. Among that number are Dinosaurus, Grand Regent Thragg, Space Racer, and Universa, who are all introduced in the next 12 to 15 issues of the comics.

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.