"THE (VERY) BIG BIRD JOB"
In their first con back from vacation, after settling in Portland, Oregon, Eliot Spencer mentioned that he had spent his time off getting together with some old friends. In a flashback we saw that his reunion was more than just for a few beers - Eliot and his old buddy blew up an Iranian nuclear missile that was set to launch.
His old friend? A big bruiser of an operative played by Adam Baldwin.
It was just a quick cameo, and no name was given - Baldwin didn't even get an on-screen credit for his appearance, if I remember correctly; he's listed at the IMDb as just "Eliot's Friend".
I'd like to think that he was appearing as John Casey from 'Chuck'.
There was one fly in the ointment, however, for this theoretical link. When Eliot asked him what's new, Baldwin's character proudly stated that Tommy made varsity. In 'Chuck', Casey only had one child, a girl named Alex who was now an adult.
Splainin: Even though they were supposedly friends, they each probably had secrets they were hiding from each other. Casey made up a cover story about his private life to protect what little personal life he had. And I'm sure Eliot wasn't about to tell him about the Leverage crew.
This is all just speculation, of course. Via Google, I found several pre-publicity articles about the episode which suggested that this cameo appearance may turn into a recurring gig. If so, there may be more Zonks down the road that need to be disabled. However, if we can maintain the illusion that he was indeed John Casey, then he would be ⅔ of the way there for membership in the TV Crossover Hall of Fame......