After 199 other episodes over 10 years, Smallville star Tom Welling says Friday's 200th episode is his favorite.

"The storyline forces Clark to reflect on the past and think about the future," he says.

8 things to know about Smallville's 200th episode

Find out which episodes his co-stars, including Allison Mack and Justin Hartley, are fond of in this video:

What's your favorite episode of Smallville?