Jonathan Groff, who plays Agent Holden Ford on Netflix's Mindhunter and voices Kristoff in Disney's blockbuster Frozen franchise, has signed on to join the cast of The Matrix 4, Collider has exclusively learned. Keanu Reeves and Carrie-Anne Moss will reprise their roles as Neo and Trinity, while Aquaman villain Yahya Abdul-Mateen II is joining the franchise as a lead, though reports that he’ll play a young Morpheus remain unconfirmed. Jada Pinkett Smith will also be back as Niobe, while the latest sequel has also added Jessica Henwick and Neil Patrick Harris, the latter of whom …