Superman superhero Krypto the Superdog is back after his dazzling big-screen debut, this time in an online animated film short that will also be a part of the Superman digital and physical releases.

English-born Terence Stamp, who burned brightly as a young actor in the 1960s, with praise heaped upon him for roles in “Billy Budd,” “The Collector” and “Far From the Madding Crowd,” memorably played ...