Captain America: Civil War, but their solo show really solidified their bond and how much they mean to each other. Sam is one of Bucky's only real support systems in the modern world, and Bucky helps to challenge Sam's sarcastic, sassy side.
A true match made in heaven. An angel and a monster hunter — who wouldn't love this relationship? Between Castiel's unwavering dedication to Dean and Dean becoming a less jaded person around Castiel, we were definitely robbed of something special.They already shared a child, so why couldn't they share their love, too?
The romantic tension between these two, especially in Season 1, was so off the charts. I truly believe they would have been one of the most iconic couples of all time if they had been.