Actually I believe the double qoute was your original problem. Bellow I have a simplified example. A double quote is going to cause the variable to be evaluated when you create the command script.

PassArray.ps1

param([string[]] $ComputerArray)

ForEach ($Computer in $ComputerArray ){

Write-Host $Computer

}

CallPassArray.ps1

$ComputerArray = @('computer1','computer2')

$Command = 'C:\work\PassArray.ps1 $ComputerArray'

Invoke-Expression $Command

When executed it will return the following:

PS M:\> C:\work\CallPassArray.ps1

computer1

computer2