In 2014/15 Dan Biggar was the star of the show as he led Ospreys to victory in a 54-point thriller over the Cardiff Blues, while fellow Wales international Liam Williams stood out in Scarlets' triumph over the Newport Gwent Dragons.
At £10 per head it was one of the bargains of the rugby season and ticket prices for this year have been frozen at that rate - including a one week booking fee holiday.
The Blues will once again take to the field against the Ospreys at 2:30pm, who are the Welsh team to beat in the GUINNESS PRO12 this year after reaching the play-offs, before the Dragons do battle with Scarlets once more at 5pm.
Fans in the stands will again be encouraged to take their seats in the East and West stands according to their allegiance to their team to create another unique spectacle and family fun for all.
"The aspiration for Judgement Day has always been to fill the stadium to its rafters," said WRU chairman Gareth Davies.
"The fact that we are in a position where that is a realistic possibility just four years into the concept is a testament to the hard work that the regions and WRU teams have put into building this fixture.
"We achieved a record crowd figure for domestic rugby in Wales last year, but there is no reason to stop there.
"We have set ourselves the target of a sell-out in 2016, it's a bold statement but one that Welsh Pro Rugby and the Guinness PRO12 is more than equal to.
"At just £10 per head, fans can see the very best that Welsh rugby has to offer go head to head in regional colours in the grand surrounds of our national stadium.
"This fixture is now set in stone, and with the chance to reserve seats this year - there's no reason to postpone joining this celebration of Welsh rugby."
Mark Davies, Chief Executive of Pro Rugby Wales, which represents the four professional teams Ospreys, Scarlets, Newport Gwent Dragons and Cardiff Blues, said: "Saturday 30th April 2016 is a date every supporter of Welsh rugby should book into the calendar now, as we look ahead with excitement to another huge double derby at the national stadium after such a positive day for Welsh professional rugby as a whole at Judgement Day this year.
"We showed this year what can be achieved when all four pro teams, Pro Rugby Wales and the WRU work together successfully achieving a record crowd that the professional game in Wales was rightly proud of.
"The hard work for the 2016 event starts now and we'd like to think this big event for Welsh Pro Rugby has a very exciting future."
BBC Wales Head of Sport Geoff Williams: "Judgement Day has become one of the highlights of the Guinness PRO12 season on Scrum V Live and Clwb Rygbi. It represents a key milestone in the season because of the jeopardy and extra spice involving tournament semi-final places and European qualification. We're looking forward to another great afternoon of PRO12 derbies."
Tickets can be purchased now at £10 per person, with no booking fees in the first week of sale (£1.85 per ticket thereafter) from www.wru.wales/tickets, by calling 0844 847 1881, in person from the WRU Ticket Office on Westgate Street or from each of the four regions.
Season tickets purchased from either of the home teams - Blues and Dragons - include access to Judgement Day IV, please liaise with your respective box offices.
Both matches will be shown live on television with BBC Wales showing the first match and S4C the second.
JUDGEMENT DAY IV
Saturday 30th April 2016
Match 1: Cardiff Blues v Ospreys (BBC Wales) - Kick off 1430hrs
Match 2: N G Dragons v Scarlets (S4c) - Kick off 1700hrs
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