The Return

Just as James and his shock troops corner the Resistance, Phillip orders the Visitors to cease to all hostilities and return to the Mothership. The Resistance discovers that the Visitors have made a worldwide ceasefire and that a majority are retreating from Earth. Via Elizabeth, it is discovered the Leader is coming to Earth to negotiate peace, and he has asked Elizabeth and the Resistance to come to the Mothership. Diana and James decide to extend the war by arming the energy swords of Phillip and Donovan during a supposedly non-lethal duel. When this attempt fails, Diana blackmails James into attempting to assassinate the Leader by having his troops blowing up the Leader's shuttle. When the destroyed shuttle is revealed as a decoy, Diana stages a coup and attempts to self-destruct the fusion reactors of the Mothership in order to kill everyone aboard and destroying Earth. It is only the Leader, working through Elizabeth telepathically, who is able to stop the self-destruct. The Leader arrives, Diana and James are captured, and Elizabeth boards the Leader's shuttle to return to the Visitor home world to guarantee peace. The episode and the series ends on a cliffhanger with Kyle stowing away on the shuttle Elizabeth is traveling in, which also has a 'going-away present' from Diana aboard.