Neil Patrick Harris joins the cast of 'Matrix 4'

And it's going to be...wait for it...LEGENDARY!

How I Met Your Mother famed star Neil Patrick Harris is the latest addition to the ensemble cast for the upcoming installment in the Matrix franchise.

The actor - best known for his stint as Barney Stinson  on the show - joins Keanu Reeves and Carrie-Anne Moss as reprise their roles in the fourth film, as well as Yahya Abdul-Mateen II, who was tapped as one of the leads last week, reported Variety.

Plot details are currently unknown.

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While it was rumoured a young Morpheus could appear in the film, sources close to Matrix 4 would not confirm Harris' specific role.

Warner Bros announced in August that a fourth Matrix film is officially in the works, with Reeves and Moss returning and Lana Wachowski on board to write and direct.

Aleksandar Hemon and David Mitchell co-wrote the script with Wachowski, who will also produce with Grant Hill. Matrix 4 is expected to begin production at the in early 2020.

Keanu reeves in the Matrix. PHOTO: INQUISITR

The role is a huge land for Harris in what would mark his first tentpole at a major studio. He was most recently seen in the Netflix series A Series of Unfortunate Events. His other recent works have included Alexander Payne's Downsizing and David Fincher's Gone Girl.

Jada Pinkett Smith is in negotiations to reprise her role as Niobe in Matrix 4 as well. She played the role in the previous three films.

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