So the story goes.... The Master has acquired a laboratory equipped with an everlasting self regenerating "Time Expander", The "Time Expander" can take any part of time and space and stretch it allowing other time and space events to interact with this new time stream. You need to stop the Master meddling with this device. You must locate the Time expander and use it to travel in time and space, but you can't do this alone. The machine requires two operators to work together... Its a tricky business, changing time and space you know? You must find all the doctors to do battle once more with the master who has joined forces with Davros and his menacing Daleks. The Master will try his damnedest to retain possession of the "Time Expander" So your challenge will not be easy.  The master and Davros are hidden within a heavily fortified fortress which is protected by a force field. Once you have activated the  "time expander" you must knock out the shields to gain access to the fortress. There you must defeat the Daleks and Davros. Only when you have enlisted the help of all the doctors and defeated Davros will you be able keep the "time expander" and allow all the doctors to return to their respective time dimension.