Finding Aliens: Advances in technology have given us unprecedented access to distant galaxies that may harbour life. However, alien life may be found closer to home. (S4, ep 10)

Antigravity: Experts discuss the possibility of advanced alien technology that could allow UFOs to fly at blinding speed or hover effortlessly a few feet above the ground. (S2, ep 10)

Alien Journeys: Alien encounters have offered a possible glimpse into the secrets of interstellar navigation. Could this one day ensure mankind's survival? (S4, ep 9)

Signs of Abduction: From loss of time and bizarre hazy memories, to terrifying accounts of alien surgery, these are the hidden signs of alien abduction. (S2, ep 9)