It's official: Cartoon Network's adult-oriented animated science-fiction sitcom "Rick and Morty" has entered production on its long-awaited third season.

Confirmation came via series writer Mike McMahan's Twitter account, which included a photograph of the cover of the opening episode's script, albeit with the episode's title carefully redacted.

RELATED: Preview: "Rick and Morty" #23

Created by Dan Harmon and Justin Roiland, the hit Adult Swim series has built a substantial fanbase for itself since its debut in 2013, but with only episodes released to date across the show's first two seasons, and the most recent installment coming out in October of 2015, fans have been anxiously awaiting news of a third season, which was announced just three episodes into Season 2, for a while now.

RELATED: Rick and Morty Season 3 Has No Release Date Yet, Dan Harmon Blames Himself

Speaking recently at the 2017 Sundance Film Festival, Harmon personally accepted his share of the blame for the long wait for the show's third season, alongside co-creator Roiland, saying, "'Rick and Morty' keeps taking longer and longer to write, and I don’t know why."

Fortunately, fans have at least had the Oni Press "Rick and Morty" comic to tide them over in the meantime, as well as this carefully-crafted piece of Rick(and Morty)Rolling from Adult Swim Australia. It may not be the "EXCLUSIVE! SEASON 3 Opening Scene" it purports to be, but it is a great reuse of the show's existing material.

"Rick and Morty" Season 3 will air on the Adult Swim programming block of Cartoon Network -- although no broadcast date has been set.