An old-timey McDonald's character is making a comeback this month—and we have all the details below. Can you guess who it is?

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

McDonald’s is bringing back its beloved Shamrock Shake with the help of an old friend. The minty green milkshake will return ...

McDonald's is bringing back its iconic Shamrock Shake — with the help of a beloved mascot's relative! McDonald's said ...

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

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

The Shamrock Shake is back at McDonald’s—and so is Grimace’s Irish uncle, Uncle O’Grimacey. And yes, there’s already ...

McDonald's is bringing Uncle O'Grimacey back to promote the Shamrock Shake. The chain has been reviving its McDonaldland ...

Enjoy a Shamrock Shake: For every Shamrock Shake purchased from Feb. 10 to Mar. 23 at participating McDonald's, 25 cents will ...

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