T.C. Greer was a corrupt prison guard who was working for Stefano DiMera and Trent/Travis. T.C. was assigned to watch Jack, and took a liking to Jen. Jen broke into the warden's office to try and get a computer password for Jack and she was caught by T.C. T.C. attempted to rape Jen, but Jack saved her when he convinced another prison guard to take him to the warden's office. T.C. payed Jack back later by beating him up in his own cell, unaware that Jen was hiding under Jack's cot because she hadn't gotten out before lockdown.
Later, Travis/Trent and T.C. searched Jen's house and learned that she was posing as a guard at the prison. Jen was fired and as a result, all of Jack's visitation and phone calls were limited to his lawyer, Mickey.
Meanwhile, Stefano announced that he wanted to become a respected citizen of Salem, secretly it was all a part of his master plan. Jennifer confronted Stefano and told him that he would need the Hortons to back him if he wanted to become a respected citizen of Salem. Jennifer warned him that if any harm came to Jack then he would not have the Hortons' backing. Stefano called T.C. and told him not to harm Jack Devereaux. Unfortunately, Travis and T.C. had pinned Jack under a press, which would smash his head flat. Luckily, T.C. and Travis stopped the press in time before it killed Jack. Jack realized that someone wanted him alive and realized that T.C. must be on Peter or Stefano's payroll.
T.C. eventually helped Travis kidnap Jennifer, but he managed to elude the police.