McDonald’s is bringing back Uncle O’Grimacey, the long-lost green mascot who originally promoted the Shamrock Shake in the 1970s. First introduced as Grimace’s Irish uncle, he disappeared from McDonald’s marketing but is now making a comeback to celebrate the Shamrock Shake’s return on February 10,

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.”

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