( no spoiler and just plot detail ) i can not understand such hatred for this episode . you want to watch a bad episode of smallville . watch subterranean now there a sack of crap . tom well give a good performance ( i do not say that very often ) and and michael rosenbaum be great and but he be most of the time . the alternate universe scenario seem eerily realistic . the martian manhunter and who previously appear in static and return and tell clark that the doctor that be the head of the insane asylum where they be be hold at be actually a phantom from the phantom zone and and if clark want to return to his universe and he must kill him . an overall great episode and with good acting and a decent pace .