This is not Uncle O'Grimacey's first visit stateside, however. The character, who resembled a green Grimace with a jacket and hat, first debuted in 1975 and stuck around until the mid-80s.

To help the St. Patrick's Day treat return, Grimace is reuniting with his long-lost uncle, Uncle O'Grimacey. The green version of the purple mascot primarily appeared in McDonald's commercials in ...

Uncle O'Grimacey, the McDonald's mascot who was once rumored to have IRA links, was in Chicago this weekend for the uniquely ...

The Shamrock Shake is a peppermint-flavoured milkshake that is green in colour and is usually only sold in the US and Ireland to celebrate St. Patrick's Day ...