Letek led the science team, consisting of himself, Mordoc and Kayron down to Delphi Ardu IV, in a joint Ferengi-Federation venture to discover the source of the powerful force field that immobilized both their Marauder and the USS Enterprise-D.
Once on the surface Letek and his team attacked the Enterprise away team, lead by Commander William T. Riker, preparing to claim that the Enterprise party attacked them first, when he was questioned by Mordock about breaking their agreement with Captain Jean-Luc Picard.
Later, when the source of the field was discovered to be a Portal of the Tkon Empire, Letek first "volunteered" Riker to answer Portal 63's challenge. Letek then attempted to negotiate with the Portal by offering to destroy Enterprise if his own starship were released. However, when Riker answered the challenge and Portal released the Enterprise, Letek asked what of his vessel, claiming that they knew the answer as well. (TNG: "The Last Outpost")