The entire Marvel Universe is in danger from Thanos, who is on the verge of collecting all Infinity Stones. But this Marvel Universe isn't quite like the one we know. This one is filled with Muppets and the creations from the world of Jim Henson. And they're in just as much trouble. Their only hope lies in the Doctor, a renegade Time Lord from the planet of Gallifrey, who has visited the "Marvelous World" once or twice (or maybe more) before in her previous lives. Now, her greatest allies - the Moya crew - seek in her help to stop Thanos. But it will take more than a TARDIS and a sonic screwdriver to defeat a Mad Titan!