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Transporting three Ullian mind-probing historians, the Enterprise crew is stymied when some of its members fall into a coma. Deanna Troi, the first crew member to come through it, cannot recall anything surrounding the incident.


Robert Wiemer


Gene Roddenberry (created by), Pamela Gray (teleplay by) | 4 more credits »




Episode complete credited cast:
Patrick Stewart ... Capt. Jean-Luc Picard
Jonathan Frakes ... Cmdr. William Riker
LeVar Burton ... Lt. Cmdr. Geordi La Forge
Michael Dorn ... Lt. Worf
Gates McFadden ... Dr. Beverly Crusher
Marina Sirtis ... Counselor Deanna Troi
Brent Spiner ... Lt. Cmdr. Data
Rosalind Chao ... Keiko O'Brien
Ben Lemon ... Jev
David Sage David Sage ... Tarmin
Rick Fitts ... Dr. Martin
Eve Brenner ... Inad
Doug Wert ... Jack Crusher
Craig Benton Craig Benton ... Crewman Davis
Majel Barrett ... Enterprise Computer (voice)


On a mapping journey the Enterprise hosts a party of Ullian 'mind historians', specialists who telepathically retrieve people's long-forgotten memories from many races. Keiko O'Brien and Dr. Crusher enjoy resuscitating pleasant memories, but the overbearing Ullian leader Tarmin's son Jev abuses his abilities on non-volunteers against their code, and enters their thus nightmare-altered memories as a key character, leaving Troi and Riker in apparently unprovoked comas which only resemble the rare Iresine Syndrome, without the associated histamine level change. Then it happens to Crusher the same way, but Troi wakes up after three days, alas with a total black-out. After eliminating any other imaginable causes, Picard has to suspect the Ullians. Troi accepts a memory probe by Jev, who makes her believe it's Tarmin's doing, but Geordi and Data do some research. Written by KGF Vissers

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TV-PG | See all certifications »

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Did You Know?


The executive dining room is a re-dress of the observation lounge set. See more »


The interface above the replicator in Troi's quarters is from an interface from older starships, and not consistent with the Galaxy-glass Enterprise. See more »


Counselor Deanna Troi: I've learned to remind myself that my mother and I are two separate individuals.
Jev: M-hm. And have you enjoyed much success with this approach, Counselor?
Counselor Deanna Troi: ...No. But I do keep reminding myself.
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Referenced in Star Trek: Birth of the Federation (1999) See more »


Star Trek: The Next Generation Main Title
Composed by Jerry Goldsmith and Alexander Courage
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User Reviews

I could see this episode upsetting a lot of folks...
22 November 2014 | by MartinHaferSee all my reviews

In this episode, a race of strange people who can read people's thoughts and memories come aboard the ship. Oddly, during their time on the ship, various crew members fall into comas--and they undergo extremely vivid and traumatic brain probings. In one of these, Troi is 'mind raped'. Can the crew figure out exactly what's happening?

This episode is one I would caution people about watching. If you've been a victim of sexual assault, seeing the rape sequence could easily be very traumatic--perhaps too traumatic. And, even if you were never a victim, the show is supposed to be entertaining-- and what the heck is entertaining about this?! Because of this, it all seems a bit exploitative and unsavory. Plus, as some have pointed out, there doesn't seem to be any definite resolution. Rather unsatisfying and one I urge you to think about twice before watching.

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Release Date:

1 February 1992 (USA) See more »

Company Credits

Production Co:

Paramount Television See more »
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Aspect Ratio:

1.33 : 1
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