The last episode of NCIS Season 23 ended with a big shock. Kasie Hines finished a late-night system reboot, but quickly found out something important was missing from her computer. A secret file called Edna was gone. Now the first look at NCIS Season 23 Episode 18 shows that this theft is not a small problem. Someone has already used the stolen program, and a person is dead because of it. The team now has to clear Kasie’s name and stop a threat that could put national security at risk.
What Happened in Episode 17 Reboot
The previous episode, which came out on April 21, 2026, was different from normal shows. The action took place mostly at night inside the NCIS headquarters. Kasie was in charge of a very important system update. She decided to do it at 1 AM to keep hackers from attacking while the systems were down.
But things went wrong very fast. One of Kasie’s tech helpers, a man named Daryl, was found dead. The team looked into what happened and found the killer was Tommy, a maintenance worker. Someone had taken Tommy’s family and was holding them hostage. They forced him to plug a special device into Kasie’s laptop.
Tommy was arrested for Daryl’s murder. But the damage was already done. When Kasie checked her computer after the reboot finished, she saw that a folder called Edna had been completely stolen. Nothing was added to the NCIS network. But something valuable was taken away.
“Edna’s not a who; she’s a what, and she’s gone. It was all about Edna,” Kasie explained to Sam, Parker, and Jimmy. When they asked what Edna is, she replied, “I’m saying I think I’m the reason why Darryl is dead.”
The First Look at Episode 18 Bad Impressions
The preview for NCIS Season 23 Episode 18, which is called Bad Impressions, shows Kasie in deep trouble. The people who stole the Edna program have already started using it for bad purposes. The preview says that someone has died because of the program.
Kasie looks very worried in the preview clips. McGee asks her if her program is valuable. She answers that it might be very valuable to certain people. Later, she tells Sam Hanna something that shows she did not understand how serious this was. She says, “Maybe I undersold it.”
Sam calls the Edna program a ‘gamechanger’. This suggests that what Kasie built is much more powerful than she thought. The official episode summary from Rotten Tomatoes says:
“The team races to help one of their own who has been framed for murder and caught in a widening conspiracy that could compromise national security.”
What Is the Edna Program on NCIS
The show has not yet given a full explanation of what Edna does. But the new information from the preview and the episode summary gives some clear clues. Edna is not a person. It is a computer program that Kasie Hines created herself.
Here is what viewers know so far:
- It is very valuable: Someone planned a murder and blackmailed an innocent worker just to steal it
- It can be deadly: The preview confirms that the program has already caused someone’s death after being stolen
- It threatens national security: The official episode synopsis says the conspiracy could put the country’s safety at risk
- Kasie did not know its full power: She admits to Sam that she may have “undersold” how important or dangerous Edna really is
The show is setting up Edna as a powerful tool that could be very dangerous in the wrong hands. Someone went through a lot of trouble to get it. Now that they have it, the NCIS team has to stop them before more people get hurt.
How to Watch Episode 18
NCIS Season 23 Episode 18 titled Bad Impressions will come out on Tuesday, April 28, 2026. It will air on CBS at the regular time of 8 PM Eastern Time / 7 PM Central Time.
Here is how viewers in different countries can watch:
- United States: CBS TV at 8 PM ET. Also on Paramount+. The Premium plan lets you watch live. The Essential plan gives access the next day
- United Kingdom: Available on Disney+, usually the day after the US airing
- Canada: Airs on Global TV the same night as the United States
- Australia: Streaming on Paramount+ the day after it airs in the US
- India: Check Amazon Prime Video or Voot for local availability
If you missed Episode 17, you can watch it now on Paramount+. The streaming service has every season of NCIS, so new viewers can also start from the beginning.
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The Cast Involved in This Story
The main cast members for this episode include Gary Cole as Alden Parker, Sean Murray as Timothy McGee, Wilmer Valderrama as Nick Torres, Katrina Law as Jessica Knight, Brian Dietzen as Jimmy Palmer, Diona Reasonover as Kasie Hines, Rocky Carroll as Leon Vance, and LL Cool J returning as Sam Hanna. Sam Hanna made a surprise appearance in Episode 17 when his flight got delayed, and he will help the team again in Episode 18.
The show is building up to the end of the season. Episode 18 will likely answer many questions about what Edna is and why it is so important. But the danger is already real. Someone is dead, Kasie is in trouble, and the team has to move fast before the situation gets even worse.
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