By 2004, Williams would begin touring with Pro Wrestling Noah in Japan where he would become a Global Honored Crown Tag Team Champion with Scorpio.

Williams continued to win many foreign and local championships, even defeating "American Dragon" Bryan Danielson in the final of a tournament in Rethel, France on 6 May 2005 to become the first International Catch Wrestling Alliance World Heavyweight Champion.

While World Wrestling Entertainment was touring England in November 2006, Williams made a dark match appearance where he lost to Carlito.

[8] This victory earned Doug a shot at the ROH World Championship on 27 July 2002, which was fought under ironman rules in a four-way contest, which also featured Christopher Daniels, Low Ki and Spanky.

[12] After another stint away, Williams returned on 14 February 2004 to defeat Chris Sabin in the pure wrestling tournament, but was later knocked out by CM Punk.

[14][15] Williams had two successful defences of the Pure Wrestling Championship, defeating Shelley in a rematch on 23 July, and Austin Aries the following day.

Williams re-appeared on TNA television on 30 April 2009, episode of Impact!, as a member of The British Invasion faction, along with Brutus Magnus and Rob Terry.

On 25 July episode of Impact!, the British Invasion, Sheik Abdul Bashir and Kiyoshi defeated the TNA Originals after Eric Young turned on his team.

[34] However, New Japan Pro-Wrestling would state that they still recognised Team 3D as the official champions since TNA did not have proper sanction to make the title change.

[38] The following month at Turning Point Williams and Magnus successfully defended the titles in a three-way match against Beer Money and The Motor City Machineguns (Alex Shelley and Chris Sabin).

Williams cashed in Rob Terry's "Feast or Fired" briefcase and used it to defeat Amazing Red for the TNA X Division Championship.

[42] Two days later Williams competed in his first Ultimate X match at a house show in London, successfully defending his new title against Daniels, Suicide, Amazing Red and Chris Sabin.

[3] At Lockdown Williams was scheduled to defend his title in a three-way Steel Cage match against both Kazarian and Moore, but was forced to miss the event due to being unable to fly out of England after the country's airspace was closed following a volcano eruption in Iceland.

[52] On 11 July at Victory Road Williams successfully defended his TNA X Division Championship against Brian Kendrick, this time in an Ultimate X submission match.

Styles, Kazarian, Robert Roode, James Storm and Matt Morgan attacked EV 2.0, a stable consisting of former Extreme Championship Wrestling performers.

When confronted by Styles, Williams turned face for the first time in his TNA career by attacking the rest of Fortune, helping Morgan clear the ring and costing Flair the match.

[69] On 31 March episode of Impact!, Williams turned heel and reformed the British Invasion with Magnus by attacking the team of Eric Young and Orlando Jordan.

[70] In their first match back together, Williams and Magnus were defeated by Ink Inc. (Jesse Neal and Shannon Moore) on 12 April episode of Xplosion.

[71] On 17 April at Lockdown, Williams and Magnus were defeated again by Ink Inc. in a four tag team number one contenders' Steel Cage match.

[72] Despite not having won a single match since their reformation, it was announced on 2 June episode of Impact Wrestling that the British Invasion would receive a shot at the TNA World Tag Team Championship at Slammiversary IX.

[73] At the pay-per-view, Williams and Magnus were unsuccessful in their challenge for the title, losing to the team of James Storm and Alex Shelley, who filled in for Robert Roode, who was sidelined with a storyline injury.

[74] On 30 June episode of Impact Wrestling, Williams and Magnus turned face by responding to Mexican America's bad remarks by praising the United States.

[75] On 14 July episode of Impact Wrestling, Mexican America's Anarquia and Hernandez defeated Williams and Magnus in a TNA World Tag Team Championship number one contender's match, following outside interference from their stablemate Rosita.

[77] On 29 December episode of Impact Wrestling, Williams was sidelined with a storyline injury, after Gunner dropped him onto the concrete floor with a DDT.

[78] Williams returned to Impact Wrestling on 9 February 2012, episode, taped in London, losing to Alex Shelley in a three-way match, which also included TNA X Division Champion Austin Aries.

[79] On 8 July at Destination X, Williams entered a tournament to determine the new X Division Champion, but was defeated in his first round match by Kenny King.

[88][89] On 1 February 2014, Williams returned to take part in TNA's Impact Wrestling tapings in London, he lost to Ethan Carter III in a singles match.

[90] The following day, Williams also took part in the tapings of the Joker's Wild II pay-per-view, where he and Magnus reunited to defeat Chris Sabin and Gunner in a tag team match.

[92] On 20 May 2018, Douglas defeated Joseph Conners, Rampage Brown and Rob Lynch to win the vacant Progress Atlas Championship.

On June 11, Williams and Smith, now called the Commonwealth Connection defeated La Rebelión Amarilla to become the NWA World Tag Team Champions.