In this hour-long special, an expert panel of robot combat builders and producers unveils a definitive list of BattleBots' Nastiest Knockouts. The biggest upsets, explosions and collisions of all time are put under the microscope, with previously unseen footage extracted from vaults deep within the program's Archive. In exclusive interviews, we finally reveal what really happened behind the drama when metal crunched metal and robots died. All the knockouts are shocking, but which of them will be chosen as the nastiest, and therefore best, KO of all time?