Learn about each Superstar on WWE’s SmackDown roster by clicking on his/her photo. SmackDown is in its 21st season and airs on Friday nights on the FOX Network. SmackDown! debuted in the United States on UPN on April 29, 1999 and originally aired on Thursday nights. The show has been broadcast from 163 arenas, 148 cities and towns, seven countries: United States, Canada, United Kingdom, Iraq in 2003 and 2004 for “Tribute to the Troops,” Japan in 2005, Italy in 2007, and Mexico in 2011.