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| Season | Episode | Title | Actor credit | Character as credited |
|---|---|---|---|---|
| 19 | 24 | The Square Apple (099) | Tim Dantay | Dr. Owen Preston |
| 19 | 36 | Moving Target (Part 1) (111) | Tim Dantay | Dr. Owen Preston |
| 19 | 45 | Security Risk (120) | Tim Dantay | Dr. Owen Preston |
| 19 | 47 | Written in the Stars (122) | Tim Dantay | Dr. Owen Preston |
| 19 | 48 | High Speed Chaos (123) | Tim Dantay | Dr. Owen Preston |
Character "Dr. Owen Preston" has been credited in 5 episodes.
(Note that the character name may appear with different spellings (e.g. "DS Beech", "D.S. Beech", "DS Don Beech", "Don Beech" are all different characters according to the credits)