The Seven Crystal Balls was a very fascinating episode. A few reasons to identify; First, you would be in major suspense at a time such as when the seven crystal balls claimed the victims of seven people who raided through the Inca temple in Peru.
Cuthbert Calculus was unfortunetely kidnapped and none of us quite knew the reason, but the ones involved with his kidnapping and the seven crystal balls are smart, and they could be anywhere at anytime.
Really, this episode centered around Tintin, Captain Haddock and Snowy was full of surprises and never bored me once.
I had no negatives in regards to this one, but the bigger event is the fact that this episode will continue onto the next week: Prisoners Of The Sun. So we'll see what becomes of the seven victims, Calculus and maybe even a more interesting adventure will take place on this next continuing episode.
Overall, The Seven Crystal Balls (first of a continuing episode) was magnificent, so I give it an 8.7/10 Great. The Seven Crystal Balls is the 13th story in the series (chronological order).