Jim Mcahren (March 19, 1984) is a British professional wrestler better known by the ring name Jimmy Havoc. He is known for his work through the British and European independent promotions. Havoc is currently regularly working for International Pro Wrestling: United Kingdom, Insane Championship Wrestling, and is currently on a hiatus from PROGRESS Wrestling and is the former and longest reigning Progress Wrestling champion Independent circuit (2004–present) Jimmy Havoc trained at NWA UK Hammerlock under Andre Baker and Jon Ryan, alongside the likes of Zack Sabre Jr and Fergal Devitt before making his debut in 2004. Wrestling exclusively under the Hammerlock banner until 2006, he made his first appearances outside of the promotion for Triple X Wrestling where he first started appearing as a "deathmatch" or hardcore wrestler. He quickly became known as one of the top deathmatch wrestlers in Europe, debuting for International Pro Wrestling: United Kingdom in 2008, Germany's Westside Xtreme Wrestling in 2009 and appearing on a joint show between WXW and U.S. hardcore promotionCombat Zone Wrestling in 2010. Havoc appeared in European versions of the CZW Tournament of Death in both 2010 and 2012. As of 2013 has made appearances in other independent companies such as Mid-Atlantic Wrestling and Full Impact Pro.

• Supermen: A Story of British Wrestlers (2014)

  
• London Rampage (2018)

  
• AEW All Out (2019)