"Captain Picard, may I welcome you in the time-honored tradition of my people..."
Plays on a mission, if your Diplomacy personnel is at that mission. While a Diplomacy personnel is at this mission, that personnel's owner must discard a card from hand to use his or her skills.
'Diplomatic Overture' is a backward compatible card form the Second Edition expansion Second Edition - ST1E compatible (Copyright 2002 by Decipher)
See collectors infos for this card in the Second Edition section under the UCT-ID: ST2E 1 C 86
Also see here for all trade lists with any card fom "Second Edition - ST1E compatible".