With the crew of the Adventurer saved (see Space Trek II) the attempt to free the Endeavour did not go quite to plan. The Endeavour was released, but only after she and her landing party were sent through the Dimensional Gate into another dimension. However this misfortune has revealed the fate of the second, third, and fourth starships as they too have all found themselves in this other dimension.
To return to their own dimension the Dimensional Gate needs to be reactivated, but the gate's key has been scattered in four pieces. The other three ships have located a piece each. This leaves one piece still missing, furthermore Captain Turner of the second starship has been imprisoned on the planet Mishma. The Endeavour's landing party will have to locate the missing key piece and also rescue the other ship's captain.
There were supposed to be more than three games in this series, it is not known how far work had progressed on the unreleased titles.
A noteworthy feature is that this game is one of the few Dragon adventures which allows the player to control more than one character, with each character having his own specialist abilities.
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Unlike the previous two games in the series no part of this game takes place on board the starship which means a larger number of planet-side locations. However none of these new locations offers the interactive amusement that is available on the ship and which is such a notable feature of the first two games. Furthermore, despite the fresh locations the number and complexity of the puzzles remains on a par with the first game.