"That's from your mysterious mission into the Soviet Union eight years ago?"

Deep down inside, he knew that this impossible, invisible planet had something to do with Seven's mysterious mission.

Naturally, he has a mysterious mission to accomplish, and the aliens are after him.

Duvivier is asked to carry out a mysterious mission for a longtime neighbor.

"Am I at last to discover the facts about your mysterious mission?"

As the spot continues, dozens, scores, hundreds of engines, without their cars, speed through the night on a mysterious mission.

The Shadow had again set forth upon some mysterious mission.

K'let had been away from camp for sometime, gone on some mysterious mission.

It is time that we learn something about them and their mysterious mission.

They began flying mysterious missions day and night with at least one returning bearing battle damage.