Sometimes, you need to get some help from someone else. But, if you want something done right, you gotta do it yourself. Thankfully for the Doctor, he can do both at the same time. In Time of the Daleks, some tasks are just too daunting to do on your own. Thankfully, there’s other Doctors who can jump in and help. And if everything should go pear-shaped, you can always just regenerate as the next incarnation of yourself.
From the preview:
Call for Help
If you don’t think you will be able to complete the Challenge on your own, you may choose to call in help from another Doctor during the Create the Dice Pool stage of the Adventure step.
To do so, discard a Sonic Charge token or Timey-Wimey card and choose another player to help you. That player now chooses to either help you from afar or come to your Location.