Note: To help refresh your memory, wiki links are provided for characters when available.
House - "Open And Shut"
Supernatural - "The Devil You Know"
Eric Johnson guest starred as 'Brady,' the executive of the pharmaceutical company and Pestilence's right-hand man/demon. Smallville fans will remember him as 'Whitney Fordman,' Lana's boyfriend from season one. He also played 'Flash Gordon' on the short-lived Syfy TV series of the same name.