When the Enterprise is fired upon by the planet-based disruptors, Scotty states that the Enterprise cannot return phaser fire because the "screens are at full strength." At no point in this or any other Star Trek series can phasers not be fired through shields.
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S 3 : Ep 24
Aired 6/3/69
S 3 : Ep 23
Aired 3/14/69
S 3 : Ep 22
Aired 3/7/69
S 3 : Ep 21
Aired 2/28/69
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