SARA and TOM JOHNSON are two very bored teenagers. But that"s all about to change. During a family vacation to an old western ghost town, the bickering siblings stumble upon a portal which catapults them back in time to the old west. As if that wasn"t odd enough, they meet a friendly baby alien whose ship has just crash landed in this prairie of the past. The creature"s mother has been captured by some greedy locals and can only survive for a few hours in the Earth"s atmosphere. The kids must somehow find a way to help the scared space visitor and his mom escape the planet before time runs out - and they"re transported back to the future.