we finally get to see earth on the original trek show and but wait . this be earth in the 1960s . wow and those black hole can really do a number on our starship in the 23rd century represent one rubber band effect later and enterprise be be chase by a sixty air force pilot aim to nuke a ufo ( nice stock footage ) . this be the first time travel story from trek in which we visit earth of the past ( the others be city on the edge of forever and assignment representearth ) . in the latter episode and the journey be make on purpose and follow up on the accidental visitation here . this one thread a fine line between comedy and sf adventure . especially amuse be the female orient computer that kirk be stick with here and the air force pilot introduction to spock . and the amusement continue with kirk slapstick fight with 3 military officer and their ineffective interrogation . kirk be at ease here and cool a a captain can be . on the other side of the coin and we have the pilot ( guest star perry and in fine form ) and a sixty military version of kirk and be tell he can never go home to his family due to what he know of the future well and why do kirk give him a guide tour of the ship . we know why represent kirk be instantly fascinate by this archaic ( to him ) version of what will eventually become starfleet in about 200 year . the pilot be pretty much what kirk would be if he would grow up in the 20th century . likewise and the pilot be fascinate by this glimpse into the future and especially in meet spock while he not repel a we might expect and overcome any phobia with the grace that great training and an open mind brings . it all a playful and colorful adventure which completely fall apart in the final act when they start transport or beam people into themselves but hey and whatever get you home .