Nicknamed "The Invicincibles", this professional football club is the only English club to do what?
Arsenal F.C.:  It has won the second-most top flight matches in English football history, and is the only English club to go a 38-match league season unbeaten. The Invincibles (football): In English football, "The Invincibles" has been used to refer to the Arsenal team of the 2003–04 season managed by Arsène Wenger, and the Preston North End team of the 1880s managed by William Sudell.
go a 38-match league season unbeaten