Misfits of Science Episode 5 (Sort of Looking For Gina)

Johnny is fascinated by a woman he's met, Gina. But whenever he meets her she disappears when he's not looking. At the same time some of the misfits believe to have seen a monster in the sewer system, so all of them go down again to investigate. They discover a young boy who's become unconscious due to supposedly bad air. Also at the same time a party is being planned for the opening of an exhibition of valuable relics from the Titanic at the museum. It turns out that Gina is working together with a group of criminals, who were planning on placing a bomb in the sewer just below the museum in order to steal the valuable pieces. The criminals had been using methane gas in the sewer in order to keep the air unbreathable and thus keep anyone away from spoiling their plan. The misfits manage to keep the museum from being destructed by the bomb at the last minute.