Farscape (1999)
S2E11 Look at the Princess - A Kiss is But a Kiss (1)
Episode Overview
Moya lands on a planet where the locals determine genetic compatibility through kissing. Crichton shares a kiss with a princess, the heir to the throne, only to find out their DNA is an exact match. This revelation means he is now obligated to marry her, and together they will rule the kingdom.
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S2