McDonald's is bringing back its iconic Shamrock Shake — with the help of a beloved mascot's relative! McDonald's said Shamrock Shakes will return to participating restaurants on Monday, Feb. 10, the company said in a news release on Tuesday.

The company said Tuesday that Grimace will reunite with his Irish uncle, Uncle O'Grimacey, bringing the mascot out of retirement after decades out of the spotlight. McDonald's originally created Uncle O'Grimacey in 1975 to promote the Shamrock Shake, but he hasn't been seen since the mid-1980s.

McDonald's announced when the Shamrock Shake will return. Here's what to know including what it tastes like, ingredients and how many calories it has.