Aaron Paul is once again boarding a dystopian sci-fi series during its third season. This time around, the Breaking Bad star is joining the cast of Prime Video’s Fallout . This marks a reunion with executive producers Jonathan Nolan and Lisa Joy after Paul worked with the  Westworld creators on Seasons 3 and 4 of the HBO show. Prime Video also announced that Annabel O’Hagan (who plays Stephanie Harper) and Dave Register (portraying Chet) have been elevated to series regulars. Based on the beloved  Fallout video game franchise, the show takes place 200 years after a nuclear apocalypse and centers on “the gentle denizens of luxury fallout shelters” as they are forced to “return to the irradiated hellscape their ancestors left behind — and are shocked to discover an incredibly complex, gleefully weird, and highly violent universe waiting for them.” Ella Purnell, Aaron Moten, Walton Goggins, Kyle MacLachlan, Moisés Arias, and Frances Turner lead the cast.…