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The Big Bad Guy spreads a Virusvirus/bacteria over the entire planet that influences your eyes/visual nerve/brain.

When you visit the planet, and pass through the portal, the virus immediately infects you, attacking your eyes, killing or disabling/temporarily poisoning most of the cells which are responsible for color vision, leaving mainly the ones for night vision( Rod cells) intact.

Alternatively, the virus could attack your visual nerve or your brain, creating the same effect.

You quickly stop to perceive colors and see everything less bright and more blurry, recognizing the world far different than it really is.

This solution has the advantage that the world can be almost similar, but still seems greyish and dark to your character, so reality and it's perception differ by far.

Of course, if you defeat the Big Bad Guy, you can obtain the antidote/some medicaments against your virus.

Or, if you simply return to our world, the virus/bacteria is going to be killed by something very usual in our world. Like UV-Rays. Or some chemical substances which are in the air.

Or it depends on some gases which are in the air on the dark side.

The Big Bad Guy spreads a Virus over the entire planet that influences your eyes/visual nerve/brain.

When you visit the planet, and pass through the portal, the virus immediately infects you, attacking your eyes, killing or disabling/temporarily poisoning most of the cells which are responsible for color vision, leaving mainly the ones for night vision( Rod cells) intact.

Alternatively, the virus could attack your visual nerve or your brain, creating the same effect.

You quickly stop to perceive colors and see everything less bright and more blurry, recognizing the world far different than it really is.

This solution has the advantage that the world can be almost similar, but still seems greyish and dark to your character, so reality and it's perception differ by far.

The Big Bad Guy spreads a virus/bacteria over the entire planet that influences your eyes/visual nerve/brain.

When you visit the planet, and pass through the portal, the virus immediately infects you, attacking your eyes, killing or disabling/temporarily poisoning most of the cells which are responsible for color vision, leaving mainly the ones for night vision( Rod cells) intact.

Alternatively, the virus could attack your visual nerve or your brain, creating the same effect.

You quickly stop to perceive colors and see everything less bright and more blurry, recognizing the world far different than it really is.

This solution has the advantage that the world can be almost similar, but still seems greyish and dark to your character, so reality and it's perception differ by far.

Of course, if you defeat the Big Bad Guy, you can obtain the antidote/some medicaments against your virus.

Or, if you simply return to our world, the virus/bacteria is going to be killed by something very usual in our world. Like UV-Rays. Or some chemical substances which are in the air.

Or it depends on some gases which are in the air on the dark side.

1
source | link

The Big Bad Guy spreads a Virus over the entire planet that influences your eyes/visual nerve/brain.

When you visit the planet, and pass through the portal, the virus immediately infects you, attacking your eyes, killing or disabling/temporarily poisoning most of the cells which are responsible for color vision, leaving mainly the ones for night vision( Rod cells) intact.

Alternatively, the virus could attack your visual nerve or your brain, creating the same effect.

You quickly stop to perceive colors and see everything less bright and more blurry, recognizing the world far different than it really is.

This solution has the advantage that the world can be almost similar, but still seems greyish and dark to your character, so reality and it's perception differ by far.