'Frozen' and 'Mindhunter's Jonathan Groff lining up to join 'Matrix 4'

Jonathan Groff – the voice of square-jawed ice farmer Kristoff in Frozen and Frozen II – is joining the cast of the new Matrix movie.

According to Collider, Groff, who also plays Agent Holden Ford in the Netflix series Mindhunter, will join Keanu Reeves and Carrie-Anne Moss on the bill in The Matrix 4, though his role is being kept under wraps.

Though how he looks in that suit in the David Fincher-produced FBI series, it's being rumoured that he could be lined up as one of the suited and booted AI 'agents' in the Matrix itself.

Read more: Matrix 4 finds its lead in Aquaman star

It's also thought that Neil Patrick Harris, who was recently announced to the cast, could also be playing a villain in the movie.

The pair join Aquaman star Yahya Abdul-Mateen II, who is playing the new lead in the long-awaited fourth Matrix movie.

British actress Jessica Henwick, who played Nymeria Sand in Game of Thrones, will also star.

Read more: Keanu Reeves has read Matrix 4 script

Lana Wachowski is back to direct the fourth movie, which is being co-penned by writer and essayist Aleksandar Hemon and David Mitchell, who penned the best-selling novel Cloud Atlas (which was also adapted by the Wachowskis in 2012.

Filming will begin next year.

The first Matrix movie landed in 1999, quickly becoming a cult classic, and was followed by The Matrix Reloaded and The Matrix Revolutions, both released in 2003.