In the season 10 Supernatural episode “About a Boy” we had a guest appearance for Nels Lennarson (SG1 & SGA) playing the dodgy bartender who both helped and hindered the investigation of some missing people one of which eventually became Dean albeit with a slightly different look.
The following week the episode broadcast on the 10th of February was called “Halt & Catch Fire” and deals with a vengeful spirit in and around a college campus (poor Dean, so much eye candy) and we got to see one of our most memorable system lords played by Jacqueline Samuda (SG1) as police Detective Petranyzk for who didn’t have a great role but a decent amount of dialogue but had plenty of time in the presence of Sam and Dean, not quite Jack and Daniel but close:)