Agent Epsilon (The Secret Saturdays)

Epsilon was in his laboratory after the Kur disaster when Zak escaped. Epsilon wasn't stupid; he knew that Francis had something to do with it and that he had betrayed the organization at that moment. Epsilon wasn't stupid.

Epsilon heard footsteps walking outside his laboratory. It was Francis, who was walking in circles. Epsilon was about to yell at Francis to come in when the laboratory's mobile phone rang.

Who is this?
Epsilon spoke, as always, without emotion.