When an approaching alien ship wipes their memory, the crew struggles to put back together what happened.



(created by), (teleplay by) (as Barry Schkolnick) | 1 more credit »

Watch Now

With Prime Video



Episode cast overview:
Commander Keiran MacDuff


The Enterprise is heading for the Epsilon solar system. A suddenly approaching alien ship uses scanners so strong that all crew members including Data lose most of their personal memories, even names and ranks, yet retain their operational and language skills. The external communications are down and computer data banks have been selectively wiped. Some, including the ship's manifest, are altered, so as to make a Commander MacDuff Executive Officer (rather then Riker) and the Enterprise is on a crucial mission in a war the Federation would be conducting for years against the Lysian race. The alien ship has been destroyed, they assume by the Enterprise, although there's no battle damage. While crew members behave differently, failing their normal reference patterns, MacDuff volunteers for a memory therapy Dr. Crusher suggests, so he can pretend for it to fail and press on the attack on the Lysian headquarters, but the war logic doesn't quite add up... Written by KGF Vissers

Plot Summary | Add Synopsis




Release Date:

15 February 1992 (USA)  »

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


47-reference: Riker says that he is reading 47 sentry pods around the perimeter of the Lysian central command. See more »


When Ro arrives, interrupting Troi and Riker's flirtation, a mic shadow is visible above them on the wall/ceiling. See more »


Counselor Deanna Troi: The bartender is an artificial life form.
Lt. Commander Data: Can I get you something? A beverage?
See more »


References Lost in Space (1965) See more »


Star Trek: The Next Generation End Credits
Composed by Jerry Goldsmith and Alexander Courage
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Where's Guinan when you need her?
25 February 2016 | by (United States) – See all my reviews

The Enterprise is struck by some force which causes everyone to forget their identities but not their skills. The information they can retrieve suggests that the Federation is in a long-term war.

With Guinan's intuition (she's been familiar with alternate time lines at least twice thus far in the series), she might have been able to shed some light on what was going on, but I suppose in that case, there wouldn't have been much of an episode. Guinan is completely missing here and Data briefly serves as a bartender.

Still, it's one of the better episodes, a real mystery similar to "Clues" but much better than that episode.

0 of 0 people found this review helpful.  Was this review helpful to you?

Contribute to This Page

Create a character page for: