Stopping 
                      on the rift in Cardiff to refuel the TARDIS, the Doctor 
                      sees a familiar face from his past running towards them 
                      on the monitor, Captain Jack Harkness. Heading off to their 
                      next destination before he can catch them, the TARDIS malfunctions 
                      and throws Doctor and Martha further forward in time than 
                      any Timelord has ever been, to the very end of the universe. 
                      When the TARDIS finally comes to a halt, they leave their 
                      ship only to discover Captain Jack lying outside the door 
                      and a horde of beast-like humanoids running towards them. 
                      Escaping to the last human stronghold in the universe, the 
                      trio meet Professor Yana who is building a rocket to take 
                      the survivors to the fabled Utopia but there is something 
                      about the Professor that is just not right.  
                    
The 
                      Doctor reunites with an old friend but he also makes a shocking 
                      discovery that will change him forever as the season heads 
                      towards a dramatic finale. 
                    Captain 
                      Jack Harkness returns to Doctor Who after getting 
                      his own spin-off show Torchwood. 
                      He's in for the adventure of his life. The man who cannot 
                      die after Rose brought him back to life has been waiting 
                      for the Doctor to return for years now. Perhaps even longer 
                      than that.
                    As 
                      the TARDIS materialises above his Torchwood base of operations 
                      in Cardiff, he makes a run for it and ends up hanging on 
                      for dear life as ship throws him, Martha and the Doctor 
                      to the very last days of the Universe. Here they discover 
                      the Human race on the brink of extinction and a lone scientist 
                      trying to save the remnants that are left by taking them 
                      to last shining light in the universe, known only as Utopia. 
                      
                    The 
                      Doctor discovers that Professor Yana is a genius, pursuing 
                      theories and inventing solutions that are way beyond anything 
                      a human could ever do. Of course the Doctor is drawn in 
                      by the science and quickly becomes involved in the rocket 
                      project but there is something about the Professor that 
                      is just not right. 
                    With 
                      Martha and Jack trying to stop the invasion of a humanoid 
                      type race attacking the compound, the Doctor and the Professor 
                      face a race against time to launch the rocket and save the 
                      human race but Yana is still hearing the voices that have 
                      tormented him all his life and they are getting louder. 
                      
                    When 
                      someone of the calibre of Sir Derek Jacobi joins the series, 
                      you know that Doctor Who has returned to the heights 
                      of its success. As Professor Yana, the veteran British actor 
                      of stage and screen brings the bumbling scientist to life 
                      but it is when he realises what the voices are and who he 
                      really is that we see why you needed a big time actor in 
                      the role. 
                    The 
                      return of John Barrowman to the series as Captain Jack Harkness 
                      is a welcome one, even though he is a little more camp than 
                      he was in Torchwood. The actor clearly relishes 
                      the role and really has fun with the acting and the continuous 
                      running the character seems to do in every episode he appears 
                      in. David Tennant raises his game to cope with the return 
                      of John Barrowman and having to act along side a legend 
                      like Derek Jacobi. 
                    ‘Utopia’ 
                      is a clearly written episode that will reveal why many of 
                      the plot points across the last few seasons were introduced 
                      by Russell T. Davies and his creative team. It is this that 
                      makes this episode pivotal to the evolution of the series 
                      and one that sets up the return of one of the Doctor’s 
                      deadliest enemies but more of that during the season finale.