You should watch:

Time's Arrow: Part 1

This was episode number 26 of season 5.

The following characters appeared in this episode:

(uncredited) Ensign Jae

Beggar

Captain Jean-Luc Picard

Counselor Deanna Troi

Commander Wiliam T Riker

Doctor Beverly Crusher

Doorman

Frederick LaRouque

Guinan

Jack London

Joe Falling Hawk

Lieutenant Worf

Lt Commander Data

Lt Commander Geordi La Forge

Samuel Clemens

Roughneck

Scientist

Seaman