A seasonal favorite will be back on the menu next week. Here's what we know about McDonald's Shamrock Shake and Oreo Shamrock McFlurry.

McDonald's brings back Uncle O'Grimacey, the beloved green mascot, to celebrate the return of the Shamrock Shake.

Grimace and Uncle O’Grimacey are welcoming the Shamrock Shake back to restaurants nationwide on Monday, Feb. 10

It's soon to be Shamrock Shake season. McDonald's Shamrock Shake, a milkshake made with vanilla soft-serve ice cream, artificially-flavored minty green syrup and whipped topping, will return to restaurants on Monday,

The beloved Shamrock Shake is coming back to McDonald's, along with a McDonald's character no one's seen since the 1980's: Uncle O'Grimacey.

McDonald's announced when the Shamrock Shake will return. Here's what to know including what it tastes like, ingredients and how many calories it has.

McDonald’s is bringing back its beloved Shamrock Shake with the help of an old friend. The minty green milkshake will return to restaurants on Monday, Feb. 10 — and the chain’s Uncle O’Grimacey character is returning after a decades-long hiatus to help kick off the annual “Shamrock Season.”

McDonald’s signature Shamrock Shake is set to return for limited time this year. The shake will be sold at participating McDonald’s restaurants nationwide starting Monday, Feb. 10. The Shamrock Shake is made with vanilla soft serve blended with McDonald’s minty Shamrock Shake syrup and topped with whipped cream.

Despite his hiatus, the green, furry icon was never forgotten. Uncle O’Grimacey earned his own merch line, called the Uncle O'Grimacey collection, which includes Shamrock Season pins, a crewneck and, even, a plain white tee that says “Who’s your uncle?” alongside an image of the uncle himself.

One of the most recognizable holiday treats at McDonald's is making its return, along with one of Grimace's relatives.