Whats the relationship between John Constantine & Oliver Queen? How was it working with the Arrow cast? Matt Ryan answers these questions and more.<br>Stephen Amell talks about working with Matt Ryan, who plays John Constantine, on Arrow!<br>Matt Ryan, title character in NBCs new series “Constantine,” joins Kathie Lee and Hoda to talk about his role in the show. » Subscribe to TODAY: .<br>Matt Ryan (John Constantine) chats at Comic Con about reading the Hellblazer comics to research his character, how his friend who owns a comic book store is .
