McDonald's will close all five of its CosMc's test locations this summer, 18 months after introducing the beverage-focused concept at four restaurants in Texas and one in a Chicago suburb.

McDonald’s is pulling the plug on its CosMc’s spinoff just two years after the alien-themed spinoff took off. The chain announced Friday that it’s closing all five locations next month. CosMc’s, named after a little-known alien McDonald’s character,

McDonald’s said Friday that it’s closing down CosMc’s, a new restaurant format it began piloting in the U.S. last year.