Retrieve Plugin on Pre-Operation

Hi guys

I have write a plugins on update, create and they works just fine but now I want to write a plugin for

Retrieve record, in this scenario,

when an account is selected on CRM page, I want to pass the company name and get some data from another application and pass it back to CRM so it can be displayed, but the problem I am having is on

Retrieve plugin it doesn't return me an Entity but only entity reference from which I can't get the select account name, also even if I get the selected account name somehow, I will have to call the Service Retrieve method to

which will trigger the Retrieve plugin again which means I ended up in an infinite loop.

I am just a beginner on CRM.

any advise will be appreciated.

thanks a lot.