With plenty of sci-fi twists and turns to close out the season, Falling Skies enters a long hiatus until next summer before we see the 2nd Mass attack the Skitters and Mechs once more in the hopes for a better world once again. What exactly is going to happen now is certainly up in the air and with a year off we likely won't know what the third year of the TNT hit drama has in store for some time. However now, we have just a brief glimpse into what we can expect as the series has booked one former television doctor to reprise his profession while main actor Noah Wyle will be reuniting with a co-star of his past.

Deadline reports that House's Robert Sean Leonard will join the TNT sci-fi series' third season for a five-episode arc that will mark the actor's first post-series gig following the ending of the FOX medical drama earlier this year.

Leonard's character on Falling Skies will be known as Roger Kadar, a doctor with a PhD who runs Charleston's power grid. It is said that he will be "obsessive" but a very "gifted" scientist who lives underground with pet rats and toys (used for science, of course). Interestingly enough, it's also been revealed that he'll be touting a nickname as well: The Rat King, a moniker given to him by the children of Charleston.

Meanwhile, another former doctor will be joining the cast for yet another five-episode stint: ER's Gloria Reuben. The actress will be working alongside her former co-star Wyle for the first time in years after the two last were on-screen together in 1999 during the long running medical drama's sixth season.

Sure to make their reunion an even happier occasion, Reuben will play Tom Mason's (Wyle) aide, and is described as being "put together, intelligent and will posses a lot of political knowledge and experience". She should be very beneficial to Mason. It has not been confirmed if Reuben will share the same five episodes as Leonard, though given that the seasons of the hit series have only consisted of 10 installments each it's likely the two shall cross paths.

Falling Skies' third season premiere has not yet been revealed by the network, but it's expected to return in Summer 2013.