Game of Thrones Prequel Aegon's Conquest Set for Epic HBO Series and Blockbuster Feature Film

If you thought HBO was done squeezing every last dragon-sized drop from the Game of Thrones universe, think again. Apparently, there’s another contender for the Iron Spin-Off Throne, and it’s about as ambitious as they come. Right now, HBO is playing a game of ‘movie or TV show?’ with a project based on Aegon’s Conquest—the story of how the original Targaryen king, with his sisters/wives (yes, both), stomped across Westeros on dragonback. We’re talking way before Daenerys, even way before House of the Dragon—like, 100 years before that and 300 years before GoT’s original run.

What’s Actually Happening With Aegon’s Conquest?

Here’s where it gets messy. According to The Hollywood Reporter, Warner Bros. and HBO can't quite decide how they want to serve this Targaryen tale. There are two camps:

• Massive Theater-Only Movie: Warner Bros. is considering making this the Game of Thrones blockbusting, Dune-sized epic for the big screen. Picture dragondogfights in your local IMAX.
• High-End HBO Drama Series: HBO’s doing what it does—mulling over another lavish prestige series to keep your streaming subscription going.

Either way, the story is irresistible for anyone who feels robbed of dragon CGI. Aegon the Conqueror and his sisters, Rhaenys and Visenya, didn't just arrive with a crown—they landed with three monstrous dragons: Balerion (literally the Black Dread), Vhagar, and Meraxes. In the span of a single campaign, they pulled off the ultimate Westeros power move, uniting (or, let’s be real, conquering) six out of the seven kingdoms. Dorne? Not interested—at least until much later.

Why Now?

This idea’s been floating around for a while. Back in 2024, news leaked that Mattson Tomlin—yeah, the guy co-writing The Batman sequel—was attached to tackle the script. Since then? Honestly, radio silence. No casting rumors, no leaks, nothing. HBO’s either keeping this under serious wraps, or it’s stuck in development purgatory.

Of course, this isn’t just about another war story. Thanks to House of the Dragon, we now know Aegon wasn’t just power-hungry—he kicked off his conquest because of a doomsday prophecy. According to the latest lore dump, Aegon foresaw an apocalyptic winter coming from the North (sound familiar?), and supposedly, only a Targaryen king could unite Westeros to stop it. That’s ‘the Song of Ice and Fire’—yep, it’s meta, that’s the name of George R.R. Martin’s whole book series.

Dragons: Big Screen or Small?

Here’s the thing: On one hand, dragons and epic battles sound tailor-made for a massive movie. On the other, if you remember how wild House of the Dragon gets, you know HBO can pull off big, fiery action without needing a cinema screen. Either option could work—if they actually make up their minds and get moving.

Other Westeros Rumblings

Oh, and while we’re at it, The Hollywood Reporter casually mentioned something else: that abandoned Jon Snow sequel? Possibly not so dead after all. There’s talk it might be resurrected—with Arya Stark possibly along for the ride and the journey shifting over to Essos. Yeah, that’s a twist no one saw coming.

What’s Next on the Schedule?

If you need something new and Thrones-y right now, you don't have long to wait. 'A Knight of the Seven Kingdoms' lands on January 18 in the US (HBO) and January 19 in the UK (Sky/NOW). House of the Dragon season 3 is supposedly coming later this year too.

'The project is being developed by HBO as a possible drama series and by the Warner Bros. film team as a mammoth Dune-sized feature film.'

As for Aegon and his conquest? Maybe it’s a movie, maybe it’s a show, maybe it joins the graveyard of spin-offs that almost were. Either way, there’s clearly no such thing as 'enough Targaryens' if you’re running HBO.