short review:
Not so bad for a TV-serial! It's the series first time-travel episode (the series had nothing to do with Jason, but was about mystical/cursed objects instead), and they managed real fine by shooting the historical parts in black & white, which enhanced the "noir" atmosphere of the fog enshrouded London streets. The end is great: after returning to their own time, Ryan and Mickey come to the conclusion that the destitute writer whom they've met, Abraham, may have been Bram Stoker, and that the events of their meeting may have prompted him to write his famous novel "The Time Travellers" - Just kidding, the particular novel was "Dracula".