The season 3 finale of Invincible hit last Thursday, and with no new episode today, Prime Video and creator Robert Kirkman are already teasing what fans can expect from the officially in-development fourth season.

Mark Grayson very nearly met his end at the hands of the bloodthirsty (even for a Viltrumite) villain known as Conquest, but he's going to come up against an even tougher opponent in season 4: Grand Regent Thragg.

There are a number of incredibly powerful characters in the world of Invincible, but a lot of fans would consider Thragg to be at least among the most formidable. We don't know who will voice the character in the show, but Kirkman has confirmed that he has been cast.

"I mean, it would certainly be weird if [Thragg] didn't show up in the show. Yeah. I mean, I don't know. It's so tough. Here's what I'll say: he's been cast,...