This is a lame "protect our planet" episode which just isn't very believable to me. Voyager has explored so many planets and met so many civilizations - if they would take meassures in their own hands all the time, if alien species pollute their planets or treat their citizens badly, then they would not have come very far. Take the Malon waste disposers for example. Tom didn't invade their planet to destroy their cargo vessels!
In this episode Tom is determined to take meassures in his own hands when an alien race, that lives on a artifical ocean planet, is about to slowly destroy their homeworld by using their industrial facilities to produce oxygen. While Voyager gives the officials information about how to use a different technology to save their planet, they don't seem to be willing to act quickly. Tom is upset and wants to destroy some of those facilities on that planet to force the alien officials to rebuild them - with new technology that won't destroy their planet anymore.
This whole "Eco Robin Hood" image doesn't fit Tom Paris. I did not believe a word. Also, how comes he always has hobbies and is interested in things, that are currently needed in an episode? Of course Tom is also an aficionado of the ocean, marine life, aquatics, the navy... Janeway later demotes him to ensign because of insubordination. At least that was satisfying to watch.
When Tom is in the brig for 30 days I wondered: Where is the toilet? It is just a tiny room with a bunk. No toilet, no washbasin, no shower, not even PJs... what do they do if he needs to pee? Lower the force field and accompany him to the restroom? By the way - I never have seen any restroom on the Voyager! Also, even worse than being bored in the brig for 30 days must be, to be the prison guard in the room next to the brig. This poor guy has to stand at his console without any diversion and watch Tom in the brig the whole day. What a lame job.
