PLAYED BY: Stephen Markle
SPECIES: Mizarian Male

Mizarian from Mizar II. Tholl, a public servant, was abducted from private meditation and awoke as a captive by unknown forces in a seemingly impenetrable cell. Eventually he was joined by Picard and other prisoners but all later escaped.

PLAYED BY: Reiner Schone
SPECIES: Chalnoth Male

Esoqq was imprisoned with Captain Picard during an alien experiment in 2366. Esoqq had been kidnapped from Chalna by unknown lifeforms, and was replaced by a near-identical copy of himself, also part of the experiment.

PLAYED BY: Joycelyn O'Brien
SPECIES: Bolian Female

Starfleet Academy cadet from Bolarus IX who began studying in 2366. Haro was kidnapped by an alien species, name unknown, who duplicated her to understand the concept of authority.
 

PLAYED BY: Jerry Rector and Jeff Rector
SPECIES: Unknown

Unnamed aliens who kidnapped and replaced a number of people in 2366 including Captain Picard. Picard later caught the aliens and forced them to leave his ship and return things to normal.