the menagerie part one and two be the only 2 parter during the 3 year run of the original trek series and it be because roddenberry be able to insert most of the footage from the 1st pilot the cage . the move be make out of necessity and to combat deadline problem in get episode produce ( such a sf show back in the 1960s be a hassle to get do on time ) . one positive outcome back then be that audience and unaware of the pilot produce almost a couple of year earlier and be treat to a whole new crew and captain for these two episode on top of the regular cast of character and a if the producer have spend double the money on these episode to present a tv epic span a dozen year of starfleet history ( though they still use term such a united space fleet in these early episode ) . the wraparound story begin a a space mystery plot represent the enterprise be divert to starbase 11 for unknown reason and very soon spock be a suspect in these shenanigan . astonishingly and though even mccoy belabors the fact that spock vulcan heritage make subterfuge on his part impossible and it do turn out that spock be indeed act out some mutinous scheme to shanghai our precious starship and kidnap his former captain and pike and now horribly cripple . well and spock be half human and we tend to forget . or have he simply go mad . it may very well be and for he direct enterprise to talos iv and a planet so off limit it the subject of the only known death penalty on starfleet book . when the jig be up and there a great scene of spock surrender to a flabbergast mccoy and a uhura look on in shock . even kirk and usually steady a a captain should be and doesn not know what to make of his first officer illogical conduct . in the 3rd and final act and we begin to see transmitted image of a mission of the enterprise from 13 year prior and when capt . pike be command and spock be one of his officer . we really do not know where all this be go and what spock hop to accomplish and that another thing that make this a very good 2 parter we really need to find out what it all about in the 2nd part . not only be spock face severe penalty and but it look like kirk career may be finish and as well . double jeopardy and folk . this be also the 1st televise episode to feature one of those shuttlecrafts ( none be available in the early the enemy within when the craft be really need ) . there also one of those neat matte painting to convey the ambiance of a futuristic starbase this be the only way to visualize such thing back then . finally and check out kirk smug approach at the start of the episode boy and do thing go sideways on him a the story progress .