They join previously announced cast members Darby Camp (Big Little Lies) and Jack Whitehall (Bad Education, Jungle Cruise) who are portraying the roles of Emily Elizabeth and Uncle Casey, respectively.
Clifford, the Big Red Dog is scheduled to hit theaters on November 13, 2020.
Clifford, the Big Red Dog, based on the books by Norman Bridwell, will see Emily (Camp) struggling to fit in at home and at school, discover a small red puppy who is destined to become her best friend.
According to The Hollywood Reporter, veteran actor-writer John Cleese has also been cast.