Little Willy McBean joins up with a Mexican monkey named Pablo to travel back in time and stop the evil Prof. von Rotten from changing history. Little Willy McBean joins up with a Mexican monkey named Pablo to travel back in time and stop the evil Prof. von Rotten from changing history. Little Willy McBean joins up with a Mexican monkey named Pablo to travel back in time and stop the evil Prof. von Rotten from changing history. Little Willy McBean joins up with a Mexican monkey named Pablo to travel back in time and stop the evil Prof. von Rotten from changing history.