Has anyone noticed that someone or something visited the Mirror Universe, it always caused some big upheavel there but when someone visited "our" universe, the reverse is not true:
Let's look at this:
"In a Mirror Darkly, Parts I and II": The USS Defiant brought back in time into the Mirror Universe. Hoshi Sato eventually takes control and presumably becomes Empress. The rebellion making gains against the Terran Empire is eventually put down and the Empire gains technology from a hundred years into the future.
"Mirror, Mirror": Kirk and co. are accidentally beamed into the Mirror Universe. He convinces mirror Spock to take over the ship and later the Empire. His disarmament, however, leads to the Empire being conquered by the Klingon-Cardassian Alliance.
"Crossover": Kira and Bashir go into the Mirror Universe, which leads to mirror Sisko into starting the Terran Rebellion.
"Through the Looking Glass": Sisko is brought into the Mirror Universe which leads to Jennifer Sisko defecting to the Rebellion and not helping the Alliance to track down the Rebels. They are later able to capture Terok Nor.
"Shattered Mirror": Schematics from "our" universe are used to build a new mirror Defiant, which repels an attempt by mirror Worf to retake Terok Nor.
"The Emperor's New Cloak": Quark and Rom go into the mirror universe to rescue Zek which leads to the Rebels capturing Regent Worf and his ship.
Now contrast this with incursions into the "normal" universe:
"Mirror, Mirror": Mirror Kirk and co. are accidentally beamed into our universe, but their barbaric attitudes quickly make it clear to Spock that they are not the name people and thus spend the duration of their visit in the brig. No long-term effects.
"Through the Looking Glass": Mirror O'Brien comes to abduct Sisko. Sisko returns shortly thereafter. No long-term effects.
"Shattered Mirror": Mirror Jennifer abducts Jake and Sisko goes after them. Both Sisko and Jake return shortly thereafter. No long-term effects.
"Resurrection": Mirror Bariel and later mirror Kira arrive in an attempt to steal one of the Bajoran Orbs. The plot fails when Bariel turns on Kira. Both return to their own universe shortly thereafter. No long-term effects.
"The Emperor's New Cloak": Mirror Ezri arrives to abduct Zek and Maihar'du and forces Quark and Rom to steal a cloaking device for her. All return to their own universe shortly thereafter. No long-term effects.
I wonder why the effects are so one-sided.
Let's look at this:
"In a Mirror Darkly, Parts I and II": The USS Defiant brought back in time into the Mirror Universe. Hoshi Sato eventually takes control and presumably becomes Empress. The rebellion making gains against the Terran Empire is eventually put down and the Empire gains technology from a hundred years into the future.
"Mirror, Mirror": Kirk and co. are accidentally beamed into the Mirror Universe. He convinces mirror Spock to take over the ship and later the Empire. His disarmament, however, leads to the Empire being conquered by the Klingon-Cardassian Alliance.
"Crossover": Kira and Bashir go into the Mirror Universe, which leads to mirror Sisko into starting the Terran Rebellion.
"Through the Looking Glass": Sisko is brought into the Mirror Universe which leads to Jennifer Sisko defecting to the Rebellion and not helping the Alliance to track down the Rebels. They are later able to capture Terok Nor.
"Shattered Mirror": Schematics from "our" universe are used to build a new mirror Defiant, which repels an attempt by mirror Worf to retake Terok Nor.
"The Emperor's New Cloak": Quark and Rom go into the mirror universe to rescue Zek which leads to the Rebels capturing Regent Worf and his ship.
Now contrast this with incursions into the "normal" universe:
"Mirror, Mirror": Mirror Kirk and co. are accidentally beamed into our universe, but their barbaric attitudes quickly make it clear to Spock that they are not the name people and thus spend the duration of their visit in the brig. No long-term effects.
"Through the Looking Glass": Mirror O'Brien comes to abduct Sisko. Sisko returns shortly thereafter. No long-term effects.
"Shattered Mirror": Mirror Jennifer abducts Jake and Sisko goes after them. Both Sisko and Jake return shortly thereafter. No long-term effects.
"Resurrection": Mirror Bariel and later mirror Kira arrive in an attempt to steal one of the Bajoran Orbs. The plot fails when Bariel turns on Kira. Both return to their own universe shortly thereafter. No long-term effects.
"The Emperor's New Cloak": Mirror Ezri arrives to abduct Zek and Maihar'du and forces Quark and Rom to steal a cloaking device for her. All return to their own universe shortly thereafter. No long-term effects.
I wonder why the effects are so one-sided.