Recently, Happy Meals included McDonald's-themed toys -- such as drink machines, fryers and trays with food on them -- delivered in mini-Happy Meal boxes. And the much-longed-for Snack Wraps finally returned after a viral fan campaign.

McDonald’s is bringing back its whimsical, fictional world and all of the brand's beloved characters for a themed meal, complete with a “first-of-its-kind” souvenir and a mystery-flavored blue and pink milkshake named for the Mt.

McDonald's dropped its McDonaldland Adult Happy Meal today and with it came the Mt. McDonaldland Shake. Here's what to know about the new limited-time only shake on the McDonald's menu. It's an ode to the volcano from McDonaldland.