Six years on and the mechanical marvels only get more sophisticated, more brutal, and show less mercy. Watch in awe as robots from all over the country battle for the right to survive another week.

The best robots in the country continue their quest to be crowned All Star Champion. Will `Razer' and `Chaos 2' win places in the final? It's all to play for in the competition's semi-final.

Six winners of previous robot wars challenges meet to battle it out and see who is the best, as they attempt to take each other out in an extreme fight to the death.

Robots from around the globe ready themselves for the ultimate contest, The Second World Championship. Will lightning strike twice for defending champions Razer, or will their reign be snuffed out by one of the many fierce competitors?

Teams from the Army, the Navy, the RAF, the Police, the Submarine service and the Fire service go toe to toe, creating plenty of carnage along the way.

Craig Charles and Philippa Forrester oversee 45 minutes of mechanical mayhem. Jonathan Pearce supplies his inimitable brand of commentary and in-depth analysis.