This episode opens with Malcolm and Travis having a discussion while playing a game of chess. Their conversation seems very out of character as the coldly discuss how every time people visit a planet somebody dies, it seems odd because if the planet is that dangerous why have away teams been sent there and shouldn't they be more concerned for their crew mates. As the Away teams return Trip suddenly gets ill and after landing the shuttle Hoshi also succumbs to the mystery illness. Dr Phlox's investigation leads him to find that they are suffering from a silicon based virus which will kill them both in a matter of hours if he can't find a cure. At this point we learn that there was a very good reason for Malcolm and Travis acting out of character; they had been possessed my non-corporeal aliens who wish to observe how humans will deal with the situation. Phlox comes up with an idea about how to save them but to administer the possible cure they will have to move them from quarantine to sickbay and either Phlox or the captain must expose himself to the virus as the equipment can't be operated while wearing protective suits. As it looks like crew members are going to start dying the two aliens argue about whether or not they should intervene to save the infected crew.
This was an good episode that managed to be exciting without any spectacular action scenes. While I immediately thought that Malcolm and Travis were behaving rather strangely I didn't work out that they were actually possessed by aliens for some time, I liked that they were just observers and hadn't deliberately infected anybody and that the infection would have happened if they weren't there, in fact ultimately their presence saves the crew. It was good to see Hoshi take a more central role for a change as Linda Park is good in the role.
This was an good episode that managed to be exciting without any spectacular action scenes. While I immediately thought that Malcolm and Travis were behaving rather strangely I didn't work out that they were actually possessed by aliens for some time, I liked that they were just observers and hadn't deliberately infected anybody and that the infection would have happened if they weren't there, in fact ultimately their presence saves the crew. It was good to see Hoshi take a more central role for a change as Linda Park is good in the role.