Below is the list of the teams who competed in IGTWCC I (Season 10)
Aberystwyth Wanderers
Adelaide Marauders RFC
Adelaide University
Aetna Fires
Archie Monty RFC
Aterui Braves
Badenoch Banshees
Barbarian Horde
Basingwerk RFC
Battlin' Weasels
BedRock (ex Longhorns)
Bernard
Bob's Bruisers
Brisbane Bandits 
Bristol
Brooksy's Babes
Büderich Fire
Bugia Nen
Caldy Crusaders
Carnage
Cill Dara RFC
Comites Montechristi
Cork Coyotes
Crooked Island Exiles
Cymru Tiger
Dallas Waratahs
Dedard Fookers
Douchebag RFC
Dragoon
East Perth Pumas
Emily's Boys
Euskadi Rugby
Fraser Tech Rebels
Frodsham Koala Bears
Gloucester Royals
Grecians
Grizzly Storm
Houston Starblazers
Ivans Warriors
Kary Mullis R.C.
Killarney RFC
KM & the Wacky Zany Kids
La Banda Bonnot
La Colonna Durruti
Llareggub RFC
Lottatori Rugby
MagnaRomagna 
Merciless 
Mid Glamorgan Exiles 
Mohicans 
Moon Area RFC 
Myrmidon Athletics 
Mysterious Mortal Magic Men 
New Day Rising 
Newbridge RFC 
Old Smegmalians 
Pacific Lions RFC
Parramatta Old Boys 
Perry Pirates 
Pride N Power 
Prophets of Splott 
Puss in Boots 
Ravello Patriots
RC La Hulpe
RC Leipzig 
reddogwonders 
Rugby Bari 
Rugby S. Protaso 
Saint Carwyn's Legacy 
Salerno Aliens 
San Tokyo 
ShrimperZone RFC 
South Auckland Titans
Southwell RFC 
Stargazers 
Steelhead RFC 
Stella Verde 
Stirling Blues RFC 
Sumas Storm 
T-Hawks 
Team Win 
The Cantankerous Gnomes 
The Irish Brigade
The Koala Bears
The Mighty Fenrisúlfr 
The Popes
The Shoguns 
The Simpletons
The Titans 
Undeads RFC 
Union Rugby Cagliari 
Whitecaps 
Winter's Warriors 
Wirral Wolves 
Wroclaw Titans
Zalaeta Rugby Club