They’re back again for the fourth or fifth time: all those cute boys in rubber suits and big fins. Yes, it’s another return visit by Mamma Mia!, the most successful of all the jukebox musicals. Mamma Mia!, of course, recycles the numerous hit tunes of Abba in a thin story about a bride-to-be who wants to know who her father is. It has the dramatic nutrition of bubble gum, but it’s fun! Set in the Greek Islands, Mamma Mia! is so sunny you’ll want to escape to an island, too—maybe Key West. At the Cadillac Palace Theatre through Dec. 31 (What will those boys do on New Year’s Eve?); 312-902-1400; $30-$85.