The Locked Room The Invisible Man : Season 1 Episode 4

An outspoken Russian scientist speaking in London is kidnapped by secret agents and locked up in the embassy. Brady follows her and breaks into the embassy before beginning a diplomatic attempt to have her freed. When this fails he sneaks her out of the building to his own house, but finds that the Russian ambassador is not going to give up the chase easily... Brady again getting involved in other people's problems, although fortunately he does have a good reason to get involved this time (the scientist has been working on refraction and could be the key to getting Brady visible again) and the episode makes full use of his invisibility. A quite unpredictable episode and well written, it builds to a rather exciting climax with some of the best effects work of the series.