Shamrock Shake is back — and so is Uncle O’Grimacey after decades away

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Uncle O'Grimacey and Grimace (McDonald's)

LOS ANGELES - McDonald’s is bringing back its beloved Shamrock Shake for the season, but this year, it comes with a side of nostalgia. 

Uncle O’Grimacey, a long-forgotten McDonald’s character last seen in the late 1970s and early ‘80s, is making a comeback.

The minty green Shamrock Shake returns to participating McDonald's locations starting Feb. 10, marking the unofficial countdown to St. Patrick’s Day. But for longtime fans, the bigger surprise might be the return of Uncle O’Grimacey, Grimace’s Irish uncle, who originally appeared in McDonald’s ads decades ago.

Who is Uncle O’Grimacey?

The backstory:

Uncle O’Grimacey first made his debut in 1975 as a festive McDonaldland character introduced to promote the Shamrock Shake. Unlike his famous purple nephew, Grimace, the green-suited, hat-wearing O’Grimacey hailed from "Sham Rock, Ireland," spreading cheer and enthusiasm for the seasonal shake.

Though he was featured in McDonald’s commercials and merchandise throughout the late ‘70s and early ‘80s, the character faded into obscurity. But now, McDonald’s is bringing him back, with plans for him to travel the country spreading "Shamrock cheer" to fans.

Uncle O'Grimacey embarks on a journey from Sham Rock, Ireland (McDonald's)

When does the Shamrock Shake return?

What they're saying:

McDonald’s Shamrock Shake and Oreo Shamrock McFlurry will be available at participating locations from Feb. 10 through March 23. The shake, which first debuted in 1970, has become a seasonal fan favorite, often selling out at some locations.

To celebrate the occasion, McDonald's is launching Uncle O’Grimacey-themed merchandise, including T-shirts and hats, which are available for pre-order.

As part of the Shamrock Shake promotion, McDonald's will also donate 25 cents from every shake sold to Ronald McDonald House Charities (RMHC), aiming to raise $5 million to support families with sick or injured children.

The Shamrock Shake’s lasting legacy

Dig deeper:

What started as a simple St. Patrick’s Day-themed menu item in 1970 has grown into an annual tradition for McDonald's fans. 

The Shamrock Shake has inspired limited-time variations, including the Oreo Shamrock McFlurry, and has even been the subject of social media "shake hunts" as customers try to track down the elusive drink before it disappears.

Now, with Uncle O’Grimacey’s return, McDonald's is leaning into nostalgia, bringing back a character many thought was gone for good.