On Friday night, SmackDown will celebrate a special milestone in sports-entertainment, and television history. The April 20 edition of SmackDown marks the show's 400th installment, making it the longest running and most successful sports-entertainment program in broadcast television. With 400 shows strong, SmackDown tops other monumental TV series including The Simpsons, Law & Order, Friends, Cheers and M*A*S*H.

A ratings powerhouse, both in its primetime slot and as The CW Network's top-rated show, SmackDown continues to dominate broadcast television on a weekly basis. More importantly, in its eight-year tenure, SmackDown has hosted some of the most extraordinary events in WWE history and all of television.

SmackDown has always been full of unpredictable and unforgettable moments. Who could forget the night when Mr. McMahon stunned the world to capture the WWE Championship? Or maybe JBL's tirade and efforts to oust border-hoppers? How about the excrutiating night in Philadelphia where a career-threatening surgery left Batista with no choice but to surrender the World Heavyweight Championship?

Want to relive more of SmackDown's most memorable moments? Check out WWE.com's List This! all month as we recap the 10 greatest moments in SmackDown history, all in preparation for Friday night's historic 400th episode.

To commemorate Friday's special show, which emanates from Milan, Italy, General Manager Theodore Long has pulled out all the stops to make sure this episode is as memorable as the 399 episodes that preceeded it.

The show will kick off with a grudge match, as former World Heavyweight Champion Batista squares off with angry Irishman Finlay. Also on the show, Deuce & Domino will get another chance to challenge London & Kendrick for the WWE Tag Team Championship, and in the main event, World Heavyweight Champion Undertaker will meet Mr. Money in the Bank, Mr. Kennedy.

For 399 episodes, SmackDown has put WWE fans on the edge of their seats, and this Friday will be no different. You can witness SmackDown history this Friday at 8/7 CT, and only on The CW Network.

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