Persistence sure does pay off. Porky Pig and Daffy Duck have been gracing screens since 1935 and 1937, respectively, but it took until now for them to star in their own full-length film, the first completely animated Looney Tunes feature to ever hit the big screen (how is that possible?). The results were worth the wait: The Day the Earth Blew Up: A Looney Tunes Movie is a consistent pleasure that should delight youngsters as well as nostalgic adults. It’s a shame that the folks at Warner Bros. didn’t honor their past but instead declined to release the film. Fortunately, indie distributor Ketchup Entertainment has come to the rescue. That studio has a more fun name anyway.

Don’t look for appearances by Tweety, Bugs Bunny, Elmer Fudd or any of the other better-known Looney Tunes characters in this effort, which gives Porky and Daffy center stage. Except that Porky does deserve a love interest,...