S4·E21 Promised Land

Dlavan (Rene Auberjonois) and his family are Tsal-Khan, offspring of the handful of aliens who remained on Earth after a bitter war of conquest with the human race. Today they live on a tightly guarded farm where they must grow all their own food, since their forebears poisoned all the plants during the war with mankind. Most of the aliens believe that the human race was wiped out in the war, but there is a group of humans in the woods near the farm. This group, is led by Rebecca (Caroline Goodall), escaped from the alien's robot run camps and includes David (Joseph Kell), Ruth (Jane Sowerby) and the mute, orphaned child Tali (Jessica Harmon). They are desperately hungry and have seen their children die from eating poisoned fruit. So, when they spot Dlavan's grandson Ma'al, wandering in the woods, they follow him home to the farm. After they see the well-fed aliens, Rebecca leads the group to raid the farm for food.