There's been a low-key cameo party going down in Game of Thrones' eighth and final season, as the show marches toward its obviously bitter end with the help of a few celebrity pals.

George R.R. Martin Won't Cameo on Game of Thrones in Season 8 -- Here's Why

Even if some of the episodes were a bit too dark, we've managed to spot a handful of familiar faces among the dizzying crowds in Season 8. Here's a look at all the famous people who've popped up in each of the final season's episodes so far.

Season 8, Episode 1: "Winterfell"

Rob McElhenney on Game of Thrones Season 8, Episode 1: "Winterfell"

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Yes, that was Rob McElhenney of It's Always Sunny in Philadelphia fame who got an arrow through his eye while guarding Euron Greyjoy's (Pilou AsbĂk) Iron Fleet. McElhenney has a long history of interactions with Game of Thrones showrunners David Benioff and D.B. Weiss, and it all culminated with his brief but gnarly death scene in the Season 8 premiere as Theon's (Alfie Allen) forces rescued Yara (Gemma Whelan) from his uncle's ship.

The premiere also featured a cheeky wink to Ed Sheeran's character, when one of Bronn's (Jerome Flynn) courtesans mentioned that the "ginger" named Eddie "came back with his face burnt right off" after the loot train attack.

Season 8, Episode 3: "The Long Night"

Chris Stapleton on Game of Thrones Season 8, Episode 3: "The Long Night"

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Game of Thrones' second episode of the season, "A Knight of the Seven Kingdoms," mostly kept the action in-house with the heroes of the North, so we didn't spot any errant celebs roaming around there. But the third episode, which featured the Battle of Winterfell, allowed country music superstar Chris Stapleton to have a little fun by appearing as one of the fallen Wildlings who were summoned up by the Night King when Jon Snow (Kit Harington) tried to attack him. Stapleton, a self-proclaiemed superfan of Game of Thrones, basically had his people call the show's people, and the rest was TV history.

The episode also featured an appearance by famed movie monster actor Javier Botet, who portrayed a nimble wight hunting Arya Stark (Maisie Williams) in that creepy library scene.

Season 8, Episode 4: "The Last of the Starks"

D.B. Weiss and David Benioff in Game of ThronesSeason 8, Episode 4: "The Last of the Starks"

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The show couldn't possibly draw to a close without showrunners D.B. Weiss and David Benioff returning to the screen one last time. The two had previously appeared among the Hall of Faces in Braavos, but this time, they were alive and well as a pair of Wildlings raising a tusk goblet alongside Tormund (Kristofer Hivju) in the Great Hall celebration scene. Perhaps it was one of them who accidentally left a Starbucks cup on the set.

Game of Thrones airs on Sundays at 9/8c on HBO.

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PHOTOS: Game of Thrones Season 8

Daenerys Targaryen (Emilia Clarke) on Game of Thrones Season 8, Episode 4: "The Last of the Starks"

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Other Links From TVGuide.com Game of ThronesRob McElhenneyChris StapletonD.B. WeissDavid Benioff