The hazard was initially located near the centre-left of the arena, where it was intended to fling competitors across the arena whenever they drove over it. This would interfere with their manoeuvrability, often disrupting attacks against opponents or simply causing them to lose control.
The Disc of Doom/Floor Spinner was a circular-shaped spinning panel built into the floor, similar to the Spinners used in the American robot combat show BattleBots. It was activated by a button similar to the pit release button, located on the upper-left side of the arena wall, though there were multiple instances where the spinner would already be active at the start of battles. The activation button initially took the form of a bumper labelled DISC (striped black and yellow in US Season 2/Nickelodeon, plain yellow in Series 6/Dutch Series 2/German Series), which was replaced by a yellow tyre in Extreme 2. All featured a hazard symbol depicting a spiral pattern, in a similar fashion to the symbols found on the pit release buttons.
The spinner had two major changes during its time in Robot Wars:
The first version of the Disc of Doom, used in the US and Nickelodeon series, had a spiral pattern on the spinner, along with teeth positioned along the spiral to tear the bottom of any competitors driving over it. However, this capability was never demonstrated, as the spinner rotated slowly and competitors such as Bunny Attack and Bigger Brother often got stuck on the Disc after being caught by the teeth. The Disc, nevertheless, also damaged Xylon's front wedge at the start of its battle while it was stationary. This version of the spinner made rare appearances in some battles from Dutch Series 2. The spinner was also known to have determined the outcome of some matches, with robots like Amok and Dragbot both becoming immobile by driving over it.
The second version of the spinner, used in Series 6, Extreme 2, Dutch Series 2 and German Robot Wars, had a cog pattern on the spinner. This version had no teeth attached to the surface and could only be used to throw competitors off-course. This was shown to have been effective on robots such as Stinger and 13 Black, which both lost control during their Heat Final match. However, for the most part, the spinner failed to make an impact on competitors with many surviving the spin. The spinner had an additional issue of wedge-shaped robots like Firestorm 4 and Dantomkia becoming wedged underneath the panel. By the end of Extreme 2, the spinner was removed entirely.
As Conquering Clown 2 had its clown head set alight, Black Widow charged aimlessly across the arena, hitting the Disc trigger at one point. Near the end of the match, Conquering Clown 2 rammed Black Widow across the Disc which threw Black Widow away.
Unibite 2.0 drove over the Disc and became stuck on the teeth. This allowed Conquering Clown 2 to slice into Unibite 2.0's sides and damage its wheels, which lead to Unibite 2.0 being unable to move on one side for the rest of the match.
First immobilisation caused by the Disc itself. Dragbot became wedged under the trigger after slamming into it and Brawler. Later on, it drove head-on into one of the teeth while trying to push Brawler, losing mobility for a few seconds as Brawler in turn pushed it further over the edge of the Disc. Dragbot proceeded to take several hits from the Disc teeth as it tried to move away, eventually escaping before losing mobility again.
While coming under attack from their opponents, Kat 3 dragged Bigger Brother onto the Disc using its axe, in turn causing Bigger Brother to get caught on the teeth. Bigger Brother was quickly freed when Rick pushed it off a few seconds later.
Dantomkia flipped Mighty Mouse into the activation trigger, then as it backed away was thrown off course after driving over the Floor Spinner. As Dantomkia attempted to flip Mighty Mouse over, the spinner unintentionally helped Mighty Mouse self right. However, Mighty Mouse would be affected later on after the Spinner propelled it off-course while charging over it.
Refbot was caught by the disc as it spun, and struggled to move off of it while preparing to count ICU out. The eliminated ICU was later affected by the Spinner as it attempted to get away from the House Robots.
Riptilion activated the button and reversed onto the Floor Spinner, sitting on top of it for a while. Later, Bigger Brother was spun on the spot along with Killer Carrot 2, which was left vulnerable to an attack from the defending UK runner-up.
Immediately into their All-Stars Heat Final, Firestorm 4 sped under the stationary Spinner, briefly getting wedged and allowing Bigger Brother to flick it from the side. Seconds later, Firestorm 4 wedged itself under the Spinner again, inadvertently allowing it to flip Bigger Brother when the latter drove over the Spinner and up its wedge shape.
Rick was immobile and was counted out on top of the Floor Spinner, Bigger Brother backed into the activation button, causing Rick to spin around and be flung off the disc. Bigger Brother then attempted to get in under Rick, to try and flip it but the Floor Spinner proved troublesome and Bigger Brother had no traction or gauge on Rick to flip it. Dead Metal attempted to grab Rick but was swerved off course and also struggled to attack it.
After pressing the button, Lightning attempted to shove Nasty Humphrey across the arena, but the Floor Spinner propelled both machines off course. Lightning attempted to adjust for another attack but continued to be affected by the Spinner. Nasty Humphrey was later affected again when chasing Lightning, where the Spinner sent it off course and open for an attack. Later, The Steel Avenger and Stinger were both affected by the spinner when in combat, being spun around and thrown off.
Micro Mute spun wildly off course every time it sped over the spinner. Argh!, when attacking Bernard and Cutlet, was affected and spun on the spot with the other two robots multiple times when driving over the spinner.
As the battle began, Amok made a charge towards Cyclone, but suddenly turned and drove over the already-spinning Floor Spinner. The Spinner propelled Amok off course, and in doing so caused its removable link to come loose.
ODT-Zero was affected only slightly as it slowly made its way forwards. The clusterbot segments of √3², being significantly lighter, were heavily affected as they were shot across the arena by the Spinner - one cluster even sat on top of it while spinning around.
Junkyard Queen got stuck on the edge of the Spinner, having one of its tyres slashed and requiring Refbot's assistance.
Appearances in Merchandise
Though rarely featured in merchandise, the Disc of Doom/Floor Spinner appears prominently in the Game Boy Advance version of Robot Wars: Extreme Destruction. It can found in all playable arenas (including the game's recreation of the Series 5-7 arena), activated by a yellow button and functioning similarly to its real-life counterpart. Unlike the real-life versions, the Disc features a unique yellow and black pattern possibly resembling cutting blades.
The Disc of Doom was the only major hazard to not be featured in any way on the Minibot arena sets.
The button trigger was pressed more times than the disc was actually used.