Holly & Stephen's Saturday Showdown (previously titled Ministry of Mayhem and MoM) is a British children's entertainment programme that was broadcast on ITV (later CITV) from 10 January 2004 to 1 July 2006.
The programme featured a mix of cartoons, celebrity guests, live music and phone-in competitions - with surreal characters, crazy games and a load of gunge thrown in for good measure.
The theme tune was sung by boyband The Noise Next Door and can be found as a B-side to their debut single "Lock Up Ya Daughters".
Other new additions included sketch series At Home with the Mayhems and later Butthaven, which featured the presenters playing 'rainbow coats' in a fictitious holiday camp of the same name - with possible inspiration from the sitcom Hi-de-Hi!, and even a special studio appearance from one of the show's stars, Ruth Madoc, who was subsequently gunged.
On 18 December 2004, Underwood presented his final edition, though this was not announced on screen until towards the end of the show - he was given a Ministry style send off.
When eventually opened, it revealed the show's new resident puppet characters, 'The Hyenas' - operated by Don Austen and John Eccleston.
Austen and Eccleston were no strangers to Saturday morning children's television with previous experience on What's Up Doc and Live and Kicking.
On 7 January 2006 after a Christmas break, the programme returned with a new format, design, theme tune, and name - Holly and Stephen's Saturday Showdown.
Only viewers on the CITV Channel were able to watch the entire 11 March 2006 edition as, over on ITV1, coverage of the qualifying session for the Bahrain Grand Prix was being broadcast from 10:30.
It was first reported on 12 May 2006 that Saturday Showdown was to be axed, which was due to ITV's in-house children's production arm closing down.
The programme was gradually phased out, eventually being dropped from the ITV network itself as of 10 June and its last three weeks airing exclusively on the CITV Channel.
There was also a new take on M.O.M favourite Cakey Sk8, plus some jabs by presenters and characters towards the decision taken by ITV to air a new cookery programme by the name of Saturday Cooks!
The Doc is usually accompanied by Stephen (as a lab-hand) for this part of the show, and the two attempt a simple experiment in order to demonstrate some scientific principle; the Doc also tries to incapacitate Stephen with laughter (and has succeeded on several occasions) by laying on thick innuendo, as well as comedic hints towards homosexuality and Nazism, much to the hilarity of adult viewers.
At least one of the experiments has resulted in a complaint to OFCOM being upheld for fear that it would encourage children to imitate a dangerous procedure.
But viewers without cable or satellite never got to see him that week, as he only fully appeared on the CITV Channel's Holly and Stephen's Saturday Showdown Extra.
After the launch of the CITV channel, viewers could switch over for a different show (similar to the interactive feature on CBBC's Mighty Truck of Stuff).
The cakes were brought on by Willoughby, in the role of "Cousin Polly with the Trolley", wearing a French maid costume and short black wig.
Then, contestants from the studio audience pair up with either one of the presenters or the show's celebrity guest to guess the titles of songs in the form of ring-tones, usually for a mobile phone or an MP3.
It involved the dwarf stuntman Ray (played by actor Raymond Griffiths) charging into a set of five doors, four wooden, one made of paper.
Ray would often fall and roll across the floor of the studio rather dramatically, and he was often checked to see if he was hurt (although Stephen often found his collisions hilarious).
A contestant would attempt to beat Ray in a one-on-one race, normally on foot, but occasionally by other modes of transport, such as husky dogs.
A game the hyenas created, an audience member is made to sit on a chair in front of a giant mouth sculpture and must talk about a subject without saying a specific word.
The most notable special edition was on 17 September 2005, in honour of ITV's 50th anniversary, where the programme celebrated the history of Saturday morning children's television on the network.
The special guests were a selection of presenters from the programme's many predecessors, sharing their memories and participating in the usual MoM items.
The guests were Sally James, Neil Buchanan, Gareth Jones, Gaby Roslin, Pat Sharp, Jenny Powell, Gail Porter and Brian Dowling - with a special appearance from Timmy Mallett.