Asylum

S4, E10: Onboard a plane zooming through a war zone, the Sliders have seconds to slide when a missile destroys the tail of the plane. Quinn and Rembrandt are knocked unconscious. With the parachutes destroyed, Maggie opens the vortex outside the plane, and she and Colin, dragging the other two, leap into it. When they land in another world, Maggie quickly realizes that Quinn may be dying and sends Colin to find help. He reaches the city, finding it to be normal -- except that there are no gas-driven vehicles and everyone is armed.