Star Trek: The Next Generation - Season 4 Episode 15 -

Commander William Riker has been on an acculturation mission under an alias for months on the Malcorian planet, surgically altered to appear like a local, but he gets badly wounded, beyond their medical skills because his internal organs are unknown to them. Captain Jean-Luc Picard decides to speed up his official diplomatic approach, formally the First Contact, and intercede on Riker's behalf, but they are told by a fascinated open-minded Malcorian scientist that her planet's culture is particularly xenophobic so they reject any alien being as being unequal to them. ...