(1) Just to avoid future confusion and arguments, although it's not strictly necessary, you might indicate these are the titles of the English translations; apart from French and Flemish/Dutch/Afrikaans originals, Tintin has been translated into dozens of other languages with some differences in title (e.g. "L'Affaire Calcule").
(2) Some of these are tricky because some of the English titles are so similar in structure; e.g., "Explorers on the" won't work as an answer for "Moon". But then I should have seen this is asking for a single missing word, rather than a phrase.
(3) How about Tintin and the Picaros, Tintin in Tibet and Tintin in America? (you might end up having to use two identical clues for the latter two, and accept either answer for each) |