This isn't the first time there was cat chaos on a major league field. In 1984, a cat made its way to the former Kingdome in Seattle, where it was not too happy to be removed from the game, The New York Times reported.
It also happened earlier this year, when the Miami Marlins found an extra player on the field.
— Miami Marlins (@Marlins)
The break in the game was apparently just what the Cardinals needed. On the next pitch, Yadier Molina hit a grand slam that put the Cardinals ahead. They ended up beating the Royals 8-5 and moved into second place in the NL Central division, MLB.com reported.