A sixth person has appeared in court charged under the Terrorism Act.
John Gorman, 56, was charged under Section 5 of the Act, which covers the preparation of terrorist acts, and with conspiracy to murder.
On Tuesday, five people with alleged links to dissident republicanism appeared separately in private at the court and were charged under Section 5 of the Terrorism Act and with conspiracy to murder.
Anton Duffy, 39, Martin Hughes, 34, and Stacy McAllister, 27, from Glasgow, Paul Sands, 30, from Ayr, and Edward McVeigh, 26, from Portpatrick, Dumfries and Galloway, were arrested on Wednesday October 23 in an operation led by Police Scotland and involving the Police Service of Northern Ireland and the security service.
All five made no plea or declaration and they were remanded in custody.
The five suspects were charged with plotting to murder former loyalist chief Johnny " Mad Dog" Adair, the Scottish Sun reported.
Following the five arrests last week, Police Scotland said the operation focused on the "activities of individuals sympathetic to dissident republicanism but who are not affiliated to any specific group".
The court appearances of the five happened amid heightened security with armed officers inside and outside the court building.
They had been held at the Scottish Terrorist Detention Centre in the Govan area of Glasgow and were taken to court in a police convoy.