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.

Invincible's evil variants of Mark Graysons are abruptly shunted out of the episode before the climax, setting up their potential return.

It seems the latest Invincible episode "What Have I Done?" delivers on the promise made in the mid-credits scene of the previous episode.