A changed letter

When I leave the television on
Without the sound
On the drama channel
I see the same actors
Rotating through their many  roles
The handsome  yet slightly too
So probably evil
The perfect,so good.
In different garments they make a  less rich world
That anyone might imagine.
A changed letter,a meaning leaps.
A scream it’s the adverts  now.
I’m not even looking
Because I knew it all
From the first moment you spoke
But you were him then
Yet I was me.