The Original Series: Season 2 (1967-1968)
S02E18

Obsession

Stardate: 3619.2 Year: 2267

Captain Kirk becomes obsessed with destroying a mysterious entity.

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Broadcast: 15 December 1967
Format: Episode Prod #: 047
Writer(s): Art Wallace
Director(s): Ralph Senensky
Story Order: 215 | Correct Order: 48