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?

Uncle O'Grimacey, Grimace’s Irish green uncle, is back at McDonald’s after 40 years to promote the return of the Shamrock ...

A McDonald's character ... Tuesday showed Grimace tracking down his uncle via Ancestry.com. Uncle O'Grimacey, who first appeared in 1975, lives on Ireland's Sham Rock Island, according to McDonald ...

McDonald’s beloved giant purple character Grimace is back, and this time he’s brought along someone(thing?) special to help promote the chain’s yearly Shamrock ...

The fast-food chain announced its seasonal, green milkshake has returned, along with the return of a beloved family member — ...

After disappearing from the public eye for roughly 40 years, Grimace’s Irish ... the seasonal shake and celebrate the 50th year of Ronald McDonald House Charities, Uncle O came from Sham ...

the fast-food chain will once again donate part of sales to the Ronald McDonald House Charities, McDonald's announced. The company is bringing out Grimace and his uncle Uncle O'Grimacey for a long ...

two beloved members of the McDonald's family are reuniting for the first time in decades. A Special Shamrock Visit from Uncle O'Grimacey This Shamrock Season celebration came to life when Grimace ...