Clifford the Big Red Dog already had a movie, you may remember it from 2004 when it was called “Clifford’s Really Big Movie”. That one had John Ritter [“Three’s Company”] voicing Clifford and an all-star cast consisting of Wayne Brady, Wilmer Valderrama, Jenna Elfman, John Goodman, Kel Mitchell, Judge Reinhold and Ernie Hudson voicing other characters. But one really big movie is not enough for one big red dog and that means Clifford will be getting another movie – this one entitled, simply, “Clifford The Big Red Dog” in two years with a voice cast yet to be announced [although Ritter has passed away].
“Clifford The Big Red Dog” is currently scheduled to be released on April 8, 2016.
Source: The Hollywood Reporter