Which CSI episode was the 300th overall episode?

Which CSI episode was the 300th overall episode? “Frame by Frame” was the 300th episode of CSI: Crime Scene Investigation.

The milestone episode is the fifth episode of season 14 and originally aired on October 23, 2013. Its story begins with a murder at a movie producer’s mansion, but the investigation soon connects the crime to a cold case from 14 years earlier.

The episode also revisits CSI’s early history through newly filmed flashbacks. Marg Helgenberger returned as Catherine Willows, linking the present-day investigation to the original case. Jason Priestley appeared as a guest star, while Sara Sidle and Conrad Ecklie helped uncover the connection between the two crimes.

A common mix-up is confusing “Frame by Frame” with nearby season-14 episodes such as “Passed Pawns” or “Check In and Check Out.” “Passed Pawns” is episode 301, while “Check In and Check Out” is episode 304. The number 300 refers to the series-wide count, not the season-14 episode number.