First episode in color.
With this episode, stunt woman Cyd Child entered the series. On her first day on the set, a stage-hand thought she was Diana Rigg and asked her for an autograph. She signed her name and he grew angry saying "I suppose you think that's funny" and stormed off. Later he apologized to her.
The folks of BVS believe Venus may harbor life as we know it. Since the late 1850s writers had depicted Venus as a cloud covered tropical jungle. By the time this episode was made, the Russian Venera program and the US Mariner program were starting to solve the mysteries of the planet. We now know the surface of Venus is hot enough to melt lead with atmospheric pressures 100 times Earth normal.
First appearance of the iconic "Mrs. Peel We're Needed" card.
French title: Bons baisers de Vénus.