'Smallville' Turns 20! Cast Reunites and Reflects on the Series' Biggest Moments! (Exclusive)

To celebrate the 20th anniversary of 'Smallville,' stars Tom Welling, Kristin Kreuk and Michael Rosenbaum reunite to look back on fan-favorite episodes and share behind-the-scenes moments! Plus, could some type of 'Smallville' spinoff be in the works? Only ET has the inside scoop! 'Smallville: the Complete Series' is coming to Blu-ray for the first time ever on Oct. 19.