You will watch Doctor Who Season 1 Episode 5 World War Three live free series episodes with HQ-high quality. You are about the watch Doctor Who Season 1 Episode 5 World War Three the online episode for free (High Quality Stream). Stream Doctor Who Season 1 Episode 5 World War Three. The Doctor learns that the Slitheen are not invading Earth but rather raiding it for commercial gain. The Slitheen claim there is a threat to national security and request that the United Nations release the nuclear activation code so they can strike down a dangerous ship hovering over London. The Doctor speculates they will fire at other countries, start World War III and sell the remaining radioactive weapons.