Time's Arrow, part 1

Data's head is found in a cave beneath San Francisco, dated five centuries old. While the Enterprise investigates aliens on Devidia, Data is pulled into 1893 San Francisco, where he finds Guinan and Clemens. Picard's away team follows the aliens through a portal.

• Leads to Time's Arrow, part 2 (S06E01): Resolves the cliffhanger: Picard's team follows the aliens through their portal to nineteenth-century San Francisco.

Captain's log, stardate 45959.1. The Enterprise has been recalled to sector zero zero one on a priority mission. All we've been told is that evidence has been discovered indicating the presence of extraterrestrials on Earth five centuries ago.

Captain's log, stardate 45960.2. We have transported the materials discovered in the cavern back to the ship for analysis. I wish I could be as dispassionate about the implications as my second officer.

Captain's log, supplemental. Close range sensor analysis has yielded no further trace of Commander Data. Despite the emotional repercussions among my crew, I must move this mission forward.

Captain's log, stardate 45965.3. An away team has beamed to the surface with a device which may enable them to phase-shift into the alien world.

Characters with no lines who appear according to the cast list or the stage directions.

• Ensign Gates (cast list)

From Memory Alpha. Linked where the credit could be matched to a transcript label.

Starring

• Patrick Stewart as Capt. Jean-Luc Picard (Captain Jean-Luc Picard)
• Jonathan Frakes as Cmdr. William Riker (Commander William T. Riker)

Also starring

• LeVar Burton as Lt. Cmdr. Geordi La Forge (Lieutenant Commander Geordi La Forge)
• Michael Dorn as Lt. Worf (Lieutenant Worf)
• Gates McFadden as Dr. Beverly Crusher (Dr Beverly Crusher)
• Marina Sirtis as Counselor Deanna Troi (Counselor Deanna Troi)
• Brent Spiner as Lt. Commander Data (Lieutenant Commander Data)

Guest stars

• Jerry Hardin as Samuel Clemens (Samuel Clemens)
• Michael Aron as Jack London
• Barry Kivel as doorman
• Ken Thorley as seaman
• Sheldon Peters Wolfchild as Joe Falling Hawk
• Jack Murdock as begging forty-niner
• Marc Alaimo as Frederick La Rouque
• Milt Tarver as Federation scientist

Special guest star

• Whoopi Goldberg as Guinan (Guinan)

Co-star

• Michael Hungerford as Roughneck

Uncredited co-stars

• K.C. Amos, Grace Harrell, Alex Landi as operations officer (3 performers)
• David Keith Anderson as Armstrong
• Lena Banks as operations ensign
• Joe Baumann as Garvey
• Eugenie Bondurant as Devidian woman
• Debbie David as Russell
• Tracee Lee Cocco as Jae
• Hal Donahue as command lieutenant
• Christie Haydon as command ensign
• Mark Lentry as civilian
• Marianne Lewis, Sherry O'Keefe, Roma Lee Tracy, Michael Wilkinson as literary reception guest (4 performers)
• Michael Moorehead as sciences ensign
• Keith Rayve as civilian
• Joycelyn Robinson as Gates (Ensign Gates)
• Robert Seeley as Devidian
• Noriko Suzuki as operations ensign