The Doctor
Played by Robert Picardo.
The Doctor
Voyager's Doctor is a holographic figure an emergency medical program devised by Starfleet programmers. When the ship's doctor and entire medical staff were killed in the "Caretaker's" displacement wave, the Doctor by necessity became the resident physician aboard the U.S.S. Voyager, assisted by first Paris and then Kes, a quick study in medical training. The program's first statement upon activation is usually "Please state the nature of the medical emergency;" the automatic command was altered to allow his own creativity, but the Doctor preferred the known opening to creating his own more clever and personable lines. For security's sake in a crisis it carries its own power grid separate from the nominal ship's Holodeck system. His wide array of programming has allowed him to keep Neelix alive with holographic lungs, save the Vidiian hematologist Danara Pel via a temporary holographic body, and even to alter DNA so as to remerge Torres' human and Klingon halves, reform Paris and Janeway from their retro-evolution as amphibians, and ensure the safety of Wildman's human-Ktarian baby at birth.

From The Official Star Trek Website

Regular

Star Trek: Voyager

001
Caretaker
002
Parallax
003
Time and Again
004
Phage
005
The Cloud
006
Eye of the Needle
007
Ex Post Facto
008
Emanations
010
State of Flux
011
Heroes and Demons
012
Cathexis
013
Faces
014
Jetrel
015
Learning Curve
016
The 37's
017
Initiations
018
Projections
019
Elogium
021
Twisted
022
Parturition
023
Persistence of Vision
024
Tattoo
025
Cold Fire
026
Maneuvers
028
Prototype
029
Alliances
030
Threshold
031
Meld
032
Dreadnought
033
Death Wish
034
Lifesigns
035
Investigations
036
Deadlock
037
Innocence
038
The Thaw
039
Tuvix
040
Resolutions
041
Basics (I)
042
Basics (II)
043
Flashback
044
The Chute
045
The Swarm
046
False Profits
047
Remember
048
Sacred Ground
049
Future's End (I)
050
Future's End (II)
051
Warlord
052
The Q and the Grey
053
Macrocosm
054
Fair Trade
055
Alter Ego
056
Coda
057
Blood Fever
058
Unity
059
Darkling
060
Rise
061
Favorite Son
062
Before and After
063
Real Life
064
Distant Origin
065
Displaced
066
Worst Case Scenario
067
Scorpion (I)
068
Scorpion (II)
069
The Gift
071
Nemesis
072
Revulsion
073
The Raven
074
Scientific Method
075
Year of Hell (I)
076
Year of Hell (II)
077
Random Thoughts
078
Concerning Flight
079
Mortal Coil
080
Waking Moments
081
Message in a Bottle
082
Hunters
083
Prey
084
Retrospect
085
The Killing Game (I)
086
The Killing Game (II)
087
Vis Vis
088
The Omega Directive
089
Unforgettable
090
Living Witness
091
Demon
092
One
093
Hope and Fear
094
Night
095
Drone
096
Extreme Risk
097
In The Flesh
098
Once Upon a Time
099
Timeless
100
Infinite Regress
101
Nothing Human
102
Thirty Days
103
Counterpoint
104
Latent Image
105
Bride of Chaotica!
106
Gravity
107
Bliss
108
Dark Frontier (I)
109
Dark Frontier (II)
110
The Disease
111
Course: Oblivion
112
The Fight
113
Think Tank
114
Juggernaut
115
Someone to Watch Over Me
116
11:59
117
Relativity
118
Warhead
119
Equinox (I)
120
Equinox (II)
121
Survival Instinct
122
Barge of the Dead
123
Tinker, Tenor, Doctor, Spy
124
Alice
125
Riddles
126
Dragon's Teeth
127
One Small Step
128
The Voyager Conspiracy
129
Pathfinder
130
Fair Haven
131
Blink of an Eye
132
Virtuoso
133
Memorial
134
Tsunkatse
135
Collective
136
Spirit Folk
137
Ashes to Ashes
138
Child's Play
139
Good Shepherd
140
Live Fast and Prosper
141
Muse
142
Fury
143
Life Line
144
The Haunting of Deck Twelve
145
Unimatrix Zero (I)
146
Unimatrix Zero (II)
147
Imperfection
148
Drive
149
Repression
150
Critical Care
151
Inside Man
152
Body and Soul
153
Nightingale
154
Flesh and Blood (I)
155
Flesh and Blood (II)
156
Shattered
157
Lineage
158
Repentance
159
Prophecy
160
The Void
161
Workforce (I)
162
Workforce (II)
163
Human Error
164
Q2
165
Author, Author
166
Friendship One
167
Natural Law
168
Homestead
169
Renaissance Man
170
Endgame (I)
171
Endgame (II)

Uncredited

Star Trek: Deep Space Nine

112
Doctor Bashir, I Presume?