ET was on the set of the hit show as they filmed their first season.
The series finale of 'The Big Bang Theory' airs May 16 on CBS.
ET spoke with Kaley Cuoco about the long-running series' finale episode, airing May 16 on CBS.
The actress told ET she's all cried out after an emotional few days wrapping the beloved sitcom after 12 seasons.
The co-stars filmed their final episode together the day before.
"This is the greatest cast in the world," Kaley Cuoco dishes to ET's cameras. The 'Big Bang' finale airs Thursday, May 16 on CBS.
It's the end of an era -- and this isn't a Bazinga! The hour-long finale episode airs May 16 on CBS.
