Kopek was one of the many cats owned by the ruthless Ruby Deagle. The cat appeared in Gremlins. As his owner had a love for money, his name is from the Russian Ruble currency.
Although his owner Ruby Deagle was feared and hated throughout the entire town of Kingston Falls, he and the other cats were treated with love and affection. Kopek and the other cats most likely survived, unlike his mistress Deagle who was wiped out by a certain Gremlin during the Gremlin annihilation on the town.