My Spirit Brother Possesses You: When Brother Voodoo has exactly one action token, he can use Mind Control as a free action. He takes no damage from this use of Mind Control and he and his target modify their attack values by +1 this turn.

Fire and Smoke: Brother Voodoo can use Poison and Smoke Cloud. If there's an opposing character adjacent to him, he may use Smoke Cloud as a free action instead.

See Prime Characters for more information.

Can Brother Voodoo use Mind Control as a free action on the same turn he received an action token?
Yes. Once he has one action token, he can use Mind Control as a free action so long as he has one action token. He can use it the same turn he gets the token, or on the next turn before clearing tokens (or getting a second token).