I have 2 questions, that we faced playing the game about the alien powers.

1) How many times per encounter can I use the alien power. Is there any limitation? We were playing this alien (green one, i dont remember the name), that says that as a main player you are able to switch your cards with your opponent. So can I play this power twice, so I can change the cards with my opponent, look at them and than change the cards back again?

2) Second question is easier. If I play Warrior and lose his powers (after losing 3 or more home colonies). Do I have to discard all the experience tokens? Or do they stay after I regain back my 3rd home colony?

Thx for answers

1. Generally, if a power involves you making a decision, you cannot "undo" the decision. In the example you gave with Sorcerer or Trader (it could be either, based on what you said, but the idea's the same), he can only make one switch per encounter.

2. Warrior keeps his experience points when he loses power, since once he gets his power back he can use them again.