The Rugby World Cup kicks off tomorrow with 20 teams battling to lift the famous Webb Ellis Cup.
The tournament is being held in Japan for the first time and England, Wales, Scotland and Ireland are all in the mix.
Here's everything you need to know.
When is it and how long is it on for?
The opening match sees hosts Japan take on the tournament's lowest-ranked side, Russia, at the Tokyo Stadium.
Kick-off is 7.45pm local time on Friday 20 September (11.45am UK time).
Twelve venues across Japan will host matches and the final will be held on 2 November in Yokohama.
When do the home nations play their first match?
This Sunday is the important day for England, Scotland and Ireland fans.
Ireland and Scotland play each other at 8.45am UK time in Yokohama, with England facing the world's 15th-ranked side, Tonga, at 11.15am in Sapporo.
Wales start their campaign on Monday morning against Georgia.
Who's in each qualifying group?
Pool A: Ireland, Scotland, Japan, Russia, Samoa.
Pool B: New Zealand, South Africa, Italy, Namibia, Canada
Pool C: England, France, Argentina, USA, Tonga
Pool D: Australia, Wales, Georgia, Fiji, Uruguay
Who are the favourites?
Rugby superpower New Zealand are again the ones to watch.
The reigning champions have won the tournament three times - more than anyone else - and they haven't been beaten in the tournament for eight years.
They are 11/8 favourites to lift the trophy, according to Sky Bet.
Officially however, the All Blacks go into the competition as only the second-ranked side in the world.
Ireland are currently the top-rated team but are only the fourth favourites with the bookies, at 9/1.
South Africa - officially the fourth-ranked side - are second favourites and are 4/1 to win.
England - who famously won the World Cup off the boot of Jonny Wilkinson in 2003 - are third favourites at 9/2.
Wales are 10/1, with Scotland considered a long-shot at 66/1.
Where can I watch - and do I have to get up early?
Possibly - the UK is currently eight hours behind Japan and that means quite a few of the matches start as early as 5.45am.
Others begin between 8am and 9am and just before noon.
The matches are being shown live on ITV in the UK.
When are the home nations' matches?
Sunday 22 Sept:
Ireland v Scotland (8.45am UK time)
England v Tonga (11.15am)
Monday 23 Sept:
Wales v Georgia (11.15am)
Thursday 26 Sept:
England v USA (11.45am)
Saturday 28 Sept:
Japan v Ireland (8.15am)
Sunday 29 Sept:
Australia v Wales (8.45am)
Monday 30 Sept:
Scotland v Samoa (11.15am)
Thursday 3 October:
Ireland v Russia (11.15am)
Saturday 5 October:
England v Argentina (9am)
Wednesday 9 October:
Scotland v Russia (8.15am)
Wales v Fiji (10.45am)
Saturday 12 October:
England v France (09.15am)
Ireland v Samoa (11.45am)
Sunday 13 October
Wales v Uruguay (09.15am)
Japan v Scotland (11.45am)
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