In the summer of 2017, the identitarian youth organization ‘Defend Europe’ deployed a ship in the Mediterranean to prove sea rescue NGOs’ alleged collusion with human smugglers and assist the Libyan Coast Guard in interdicting migrants. This study shows that Defend Europe developed organizational structures, discourses, and practices that display meaningful similarities with those of the charities it sought to oppose, strategically portraying itself as a humanitarian actor despite its very dubious humanitarian credentials. Defend Europe’s tendency to behave as a ‘doppelganger’ of sea rescue NGOs shows that institutional isomorphism and discursive frame appropriation can be found even among organizations with diametrically opposite ideologie...