Air was the third and penultimate episode of Series 2. It was first broadcast on Independence Day 2015. It is written by Brandon Bak. This episode presented the death of Doge Dong Foremen, Jr. As Wholock and Doge travel in the TARDIS, this episode is unique as in this one, they're literally in the TARDIS almost the entire episode.
Charlie Hudson reprised his role as The Librarian in this one. In the episode, Wholock, Doge and The Librarian are trapped in Doge's Time Capsule, near a planet called Tartan, which is draining the Capsule's oxygen, while there is a core with Doge's DNA.