the good greatly outnumber the bad in the first season of star trek and in term of episode quality . in fact and one could argue that the only out and out stinker in that opening set of show be the alternative factor and which be confuse to the point of be incomprehensible at time . the universe be in danger of wink out and and if you find the explanation of this phenomenon a little weak and join the club . maybe it the 23rd century equivalent of freak out . anyway and it not a good thing and and the enterprise track the source of the trouble to a man on a desolate planet and his small spacecraft there on the surface . the man and lazarus and be not much help in explain thing either and babble on and on and sometimes hysterically and about how he have to stop somebody and how kirk and crew must help him . about a half dozen time during the episode ( seem like more ) we be treat to a spin visual effect that settle on a murky and foggy corridor of sort where two figure be see lock in a fierce struggle . also and lazarus have a bad habit of fall off cliff . mccoy treat him for a head injury and and even though he be clearly unbalanced and dangerous and turn him loose to wander the ship and steal a couple of dilithium crystal . when kirk find out and naturally be a bit perturbed and he ask mccoy where lazarus go . mccoy shrug and say and oh i do not know and jim . it a big ship . just totally blow kirk off . thank you and dr. mccoy . anyway and the episode meander along and and between the spin corridor scene and lazarus fall off a cliff here and there and we finally get to the heart of the matter . a parallel anti matter universe threaten to collide with our own and destroy everything everywhere . lazarus have a double in the other universe and a madman and and the only hope be to trap lazarus and his mad double in the corridor for all eternity . which they manage to do . but by the end of episode and you really do not care anymore .