Expediente X Temporada 6 Episódio 4

While being detained near the famed Dreamland Area 51, a strange craft flies overhead and Mulder swaps bodies with an Area 51 Man-in-Black. While the other agent has fun in Mulders body, Mulder himself finds it difficult to fit into someone elses life, especially a shadowy one. Mulder contacts Scully about the body swap and tries to get her the flight data recorder from the UFO test flight, but his alter ego uses Mulders FBI persona to have him arrested.