Disney needn’t fear; “Underdog” is here. The studio and Spyglass Entertainment are putting the final touches on a deal to bring the classic TV cartoon to the bigscreen as a live-action feature. Disney has high hopes for the property as a possible franchise for its Walt Disney Pictures label. The tongue-in-cheek “Underdog” show, created by Buck Biggers and Chet Stover, made its debut in 1964 on NBC and ran until 1973. The character was an unlikely superhero: a beagle who sheds his milquetoast identity of Shoeshine Boy to become a caped superdog who speaks in rhymed couplets. Wally Cox provided his voice.