Darius and Grace must forge an emotional détente to get international cooperation. Liam meets a new scientist who has a mysterious past.

Anjali Jay, Arran Henn, David Nykl, Dennis Boutsikaris, Erica Luttrell, Hugo Raymundo, James William Challis, Joan Gregson, Madison Smith, Manoj Sood, Mark Moses, Matthew Dowden, Paul Grenier, Raresh DiMofte, Sasha Roiz, Tovah Feldshuh, Yvetta Fisiher