Underdog first appeared in ads standing in the shadow of a tall figure voiced by
Brian Blessed, using his
catchphrase "I've had an accident!" as a way of persuading the tall man to give him compensation for an unspecified injury. When the tall man refuses to do so, Underdog tells him that he will go to National Accident Helpline instead to get proper compensation for his injury. The ads end with the tall man trying to convince Underdog to come to him for compensation instead, and Underdog hurling an insult at him intended to reduce him to less than his tall stature and deep voice convey. Background music of the Underdog advertising campaigns have included such hits as
Chumbawamba's “
Tubthumping” and
Marvin Gaye's "
I Heard It Through the Grapevine" (where the chorus lyrics have been changed to include the brand name). Underdog is voiced by British comic actor
Joe Pasquale. The most recent run of ads (beginning in September 2013) featured
computer-generated imagery created by Aardman Animations. As of April 2026, Underdog has been redesigned on the Underdog.co.uk website, sparking a possible return in the future. ==Commercial success and popularity==