All at sea maybe, critics at the time lambasted this as being lame by comparison of the original doctor's series. I disagree, although many of the original cast members had gone by the way side the basic chemistry between Duncan warring and Stewart-Clark which by that time was easily the backbone of the series remained intact. Even their arch nemesis professor Loftus who technically was written out of the series staged a metamorphosis to haunt the two wise cracking and juvenile doctors.

By this time they had been sacked from St.Swithans and despite this set back they thought that they had managed to wrangle a cushy little number on a cruise liner. However, to their horror it so happened that the captain of the ship was none other than Norman Loftus sir Geoffrey's twin brother who not only was identical to his brother but shared the same personality: what rotten luck