"Westworld" offered some "Game of Thrones" nostalgia in Sunday's episode, with a wink and a nod – and even a bit of a dragon growl – to the recently departed HBO hit.

In a search for android host Maeve Millay (Thandie Newton), two former operatives of the six theme parks operated by Delos, Bernard (Jeffrey Wright) and Stubbs (Luke Hemsworth), emerge in the work area of "Park 4," a Medieval-themed park viewers haven't seen previously.

As park staff work on one host in clothing from that era and clanging swords can be heard in the distance, Stubbs explains that employees are still working as they wait to learn if they'll be laid off in the wake of the park closings after Season 2's massacre.

Bernard and Stubbs walk past another room where two workers, clad in white lab suits accented by red rubber gloves and aprons, will look familiar to avid "Thrones" fans. 

They're the Emmy-winning hit's co-creators, David Benioff and D.B. Weiss. In the scene, Weiss' character explains that they have a buyer for park remnants, "some startup in Costa Rica." That could be a nod to the fictional island near Costa Rica that is the setting for "Jurassic Park." Steven Spielberg's 1993 film is based on a novel by Michael Crichton, who wrote and directed 1973's "Westworld," on which the HBO series is based. 

The "Thrones" connection becomes more obvious when the angle shifts to reveal a dragon on the floor. When Benioff' asks how they're going to get a dragon to Costa Rica, his colleague responds, "In pieces," as he approaches the huge reptile with a circular saw. The dragon emits a low growl. 

Lisa Joy, who created the "Westworld" TV series with her husband, Jonathan Nolan, explains the genesis of the "Thrones" callback.

"We are both fans and friends of Dan (Weiss) and Dave and ("Thrones" book series author) George R.R. Martin has long joked we should do Westerosworld as some kind of crossover," she says. "A cameo with them and their little pet seemed right up our alley."

As Bernard hunkers down in an office searching computer files for Maeve's location, there are glimpses of candles, armor and swords. In another room, a musician strums a version of the "Westworld" theme on a lute-like instrument for a king and queen sitting in wooden – not iron – thrones. Another tableau from Europe in the Middle Ages shows guests drinking at a feast table.

When security officers find the unauthorized Bernard and Stubbs Stubbs literally goes medieval on them, swinging a two-headed axe.

The Middle Ages-themed park also recalls Crichton's "Westworld," which included a Medieval World.

Asked about Benioff and Weiss' acting chops, Joy says, "They killed it."