(KTLA) — McDonald’s is bringing back another McDonaldland character to help kick off the return of Shamrock Shake season.

The company announced Tuesday that Grimace will reunite with his Irish uncle, Uncle O’Grimacey, after stumbling upon his family’s original recipe for the shake.

McDonald’s created the character in 1975 to promote the Shamrock Shake, but he hasn’t been seen since the mid-1980s.

Uncle O’Grimacey will travel coast to coast, “spreading Shamrock cheer with fans everywhere and celebrating Ronald McDonald House Charities and their mission to keep families.” McDonald’s also said it will donate $0.25 to RMHC for every Shamrock Shake purchased from Feb. 10 to March 23.

Fans can also get limited-edition Uncle O’Grimacey merch during a pre-sale beginning on Feb. 4.

The Shamrock Shake, made with vanilla Soft Serve and “minty Shamrock Shake syrup,” topped with whipped cream, will return to participating restaurants nationwide for a limited time beginning on Feb. 10.

Shamrock Shakes debuted in 1970 after being created by Hal Rosen, a Connecticut franchisee who was looking for something to draw customers around St. Patrick’s Day in the mid-to late-’60s. They weren’t, however, available nationwide until 2012.

Nexstar’s Michael Bartiromo contributed to this report.