[VIDEO] Want to Watch Season One Again? The Shadowhunters Cast Tells You How! Want to know how to watch season one over and over? It's pretty simple but Dom, Kat and Alberto have got all the info you need and are adorable. #meow On screen Jace and Simon have been fighting for Clary's heart! But off screen this adorable trio are the best of friends! And they have a special message for you! Facebook Twitter Watch Again Watch Episode Could we be more in love with these guys?