Dancing Queen (S04E03)

When the Legends discover that a Fugitive is hiding in 1970s London, they realize he is part of a gang targeting the British Monarchy. Trying to stop the gang, they realize someone from the Legends must infiltrate them. Surprising everyone, Ray is the one to gain their trust after he is put through a series of tests with help from Sara and Mick. Meanwhile, Gary (Adam Tsekhman) shows Nate the ropes at the Time Bureau, but it turns out to be anything other than an ordinary day at the office. (iTunes)