Star Trek: The Next Generation, season 3, episode 23
Sarek
Summary
The Enterprise is plagued by an outbreak of violence when it is visited by the renowned Vulcan ambassador, Sarek (Mark Lenard). Discovering that Sarek is suffering from an incurable disease, Captain Picard must allow a mind-meld with him so that the ambassador can complete a last vital negotiation between the Federation and the Legaran.
Summary from Wikipedia, CC BY-SA 4.0.
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