Impostory

It's many hundreds of years into the future and mankind has experienced massive breakthroughs in the area of time travel! Unfortunately, there's been an accident in the time travel lab and hundreds of people all over history have been taken out of their time and brought into the present. 

Humanity's only hope is with the 5 remaining space-time shuttles. The timeline-refugees have voted on a group of some of the great historical figures who may be able to restore history.

But to make matters worse, the time travel accident had also displaced a group of shapeshifting aliens from deep in the future. Your job is to keep all the imposters from getting on board. Humanity depends on it!