Real Madrid in the Champions League. Six words that either send a shiver down your spine, or get your blood pumping like nothing else.
Real are quite simply the greatest side in European history, winning a quite remarkable 15 Champions League titles, including six of the last 11. When Carlo Ancelotti's side are in town, the world stops to take a look, and there aren't many teams in global sport that you can say the same for.
It is a fear-inducing prospect, but that is the gargantuan task awaiting Mikel Arteta and Arsenal in the Champions League tonight, as they take on the most successful team in the competition for the chance to reach a first semi-final in 16 years.