Karine Vanasse and Mike Vogel, Pan Am

After months of will-they-or-won't-they tension on Pan Am, Dean (Mike Vogel) and Colette (Karine Vanasse) finally seem to be on the same page. After all, she even met his parents last month. What could possibly go wrong? Um, well, his ex-girlfriend Bridget (Annabelle Wallis) -- who went MIA after he proposed to her -- could resurface.

Hopefully she's taken these last few months to think of a quasi-good explanation for standing him up.

Watch full episodes of Pan Am

Check out this exclusive clip:

Why is Bridget back? Hit the comments with your theories!

Pan Am airs Sundays at 10/9c on ABC.