Good news "Castle" fans! Everybody's returning for season 8 renewal as Nathan Fillion has joined the short "Man on the Moon."

Seamus Dever, who plays Detective Kevin Ryan, tweeted on May 12, "So, I have news for Castle fans ....https://youtu.be/cy0kNX5xrnE."

It's certainly a relief for the actor in light of the interview he did with TVGuide last March when both Nathan Fillion and Stana Katic have not signed on for "Castle" season 8 renewal yet.

The actor explained, "It's been weird. The last five months have been limbo. I don't know [what's] going to happen, and, to be honest, no one has talked to me ... about next season. I'd like to have some answers because my family wants to know if I'm going to be employed. But right now it's really up in the air."

Jon Huertas, meanwhile, posted on his Instagram a hilarious dubsmash of Mike Stud's "Back Again."

The actor sang, "See I'm back again/I got class again/Man I miss my friends/We gon do it again/It's been a hell of a summer."

Huertas, who plays Detective Javier Esposito in the show, captioned the post, "Some of u had questions about Castle season 8 - @Dubsmashapp."

Meanwhile, Nathan Fillion, who will reprise his role as Rick in "Castle" season 8 renewal, leads the cast of photographer Tyler Shields' "Man on the Moon," which lasts just two minutes and twenty three seconds.

The whole mood has the "Mad Men" look to it and Nathan Fillion is doing his best impression of the womanizer, Don Draper.

According to the YouTube description, the short is part of the new series, Historical Fiction, which is on display at The Andrew Weiss Gallery." Aside from Nathan Fillion, it also stars Christa B. Allen, Courtney Halverson, Logan Huffman, Ana Mulvoy Ten, Natalie Lind, Emily Lind, Aly Lind, Faith Picozzi, Lili Peper, Hassie Harrison, Barbera Alyn Lind, Jordon Fink, Filip Milenkovic, Luke Huffman and Alex Krosney.