Extradition to the US for a suspected al Qaida terrorist would breach his human rights and amount to an "abuse of process", his lawyer has told a court.
Abid Naseer, 24, is wanted for trial in America after being accused of being "deeply involved" in a plot to bomb the New York underground system and targets in Britain.
Ben Cooper, for Naseer, cited conditions in US "super max" prisons as one of the reasons for blocking the extradition.
"In due course, it will be submitted before this court that to permit Naseer to be tried in the US amounts to an abuse of process," he said.
Naseer, who appeared via video link from Belmarsh prison, was remanded in custody until November 2.
City of Westminster Magistrates' Court in central London has set aside December 15, 16 and 17 as provisional dates for a full extradition hearing.
Naseer was arrested in July in the north east of England by Metropolitan Police counter-terrorism officers after US authorities issued a warrant.
The US revealed it was bringing charges against Naseer and four other suspects over an alleged terrorist conspiracy.
Naseer, a Pakistani national formerly of Manchester, is alleged to have planned attacks on Manchester city centre and communicated with al Qaida leaders behind the plot.
The Government attempted to deport Naseer and a second man, Ahmed Faraz Khan, 26, to Pakistan, but a judge blocked the move on the grounds they could be tortured.