The History Channel Conspiracy Theory 12 Episode Collection : TWA Flight 800 , Majestic Twelve UFO Cover-up , FDR and Pearl Harbor , Area 51 , Who Killed Martin Luther King Jr. , Princess Diana , Lincoln Assassination , Oklahoma City Bombing, CIA and the Nazis , Jack Ruby , RFK Assassination , Kecksburg UFO ,Best Evidence : Discovery Channel 6 Episode Conspiracy and Controversy Collection : TWA Flight 800 , Bigfoot , Chemical Contrails , John Wayne's Death , the Roswell Incident , Cattle Mutilations : Total 18 Episodes : 4 Disc Box Set : Over 13 Hours