all right and first thing i have to get off my chest be that i do not understand exactly what the chinese be suppose to get out of destroy the entire earth with their doomsday machine . to quote dr. strangelove and the purpose of a doomsday device be to tell the world you have a doomsday device . why do you keep it a secret . it not like the chinese actually present a list of demand and or anything and before they blow up the world . it take a super secret mission impossible spy mission to discover that the machine exist . chairman mao be never about blow red china up . it be always his intent to simply steam roll over the west with number and the power of marxism and and allow china ( and communism ) to achieve it glorious ( and inevitable and in commie eye ) destiny . 2nd and if youre go to go to all the trouble of get your key spy people into the dm facility and couldn not you maybe have them try to sabotage the thing once they discover it . instead they just take some picture and run home and heedless of the fact that the entire facility seem to have only 3 staff people in it and and the spy kill the 2nd and 3rd one . i realize i be ask for waaaay too much for a simple and cheaply make sf clunker . but plot hole like this be weave into the very fabric of bad sf movie that will consign the genre to mediocrity for as long a people remember bad movie like this . the movie do have a few decent moment and mostly thanks to the cast . ( that why three star instead of one ) . bobby van do pretty good low key comedy relief and ( later on ) modest heroic . the old crew member ( wilcoxson ) be dignify and likable in his role a the senior scientist or statesman type . mala power be in here and as be ruta lee and and sometimes they can almost manage a reading of a line that redeem the material . the scene where the launch site be put under martial law and the launch sequence be speed up be pretty good there a nice sense of strain and worry and foreboding . but a for the rest of it sheesh . the movie can not decide which of two very different model be the actual space ship . the astronauts endure the strain and trauma of take off in what be very obviously easy chair recliner . the battle of the sex that be the real reason for for movie play out like the most ham hand soap opera you ever saw on daytime tv . the end of the world special effect include stock footage that imply that the astronaut pov suddenly switch to grind level on the planet sight ( and pov ) that they couldn not possibly have see . the plot bring up half bake science that wouldn not pass muster in the 7th grade and include a roll down curtain that supposedly block out bad radiation in the capsule and selective gravity and the idea that 3 couple be suppose to restart the human race on a planet that we know even in 1970 be not habitable . and the last 10 15 minute ( apparently film year after the main portion of the movie and with an entirely different cast of actor ) be the bad patch job i have ever see and i be include the coda from time of the ape and the devil have seven face in that list . doomsday machine be painfully bad . fortunately and it so bad that watch it become an exercise in self amusement and ( except for the last 10 minute and which be excruciatingly dull ) . watch at your own risk .