Holy war over TV show's quiz question.

Lawyers for terrorism suspect Jack Thomas will lodge an official complaint about a television quiz show question they say could prejudice his trial.

Mr Thomas, charged with receiving financial support from al-Qa'ida, providing the group with resources or support to help carry out a terrorist attack and having a false passport, was the subject of a question on Monday's Who Wants To Be a Millionaire.

On the program, a contestant answered a $1000 question that asked: "Suspected of associating with the terror network al-Qa'ida, Joseph Terrence Thomas, was dubbed what? a) Jihad Jack; b) Joe Blow; c) Terror Terry; or d) Thomas the Tank Buster."

Thomas's solicitor, Rob Stary, said yesterday he would lodge a complaint with the Victorian Director of Public Prosecutions this week.

Thomas's brother, Les Thomas, said their grandmother, aged in her late 70s, watched as the question was aired.

"My grandmother nearly choked on her biscuits when she saw it," Mr Thomas said.