Packer was the security chief of I.E. (International Electronics) in the Doctor Who serial, The Invasion, who worked together with the Cybermen.
Packer served under managing director Tobias Vaughn and failed many times to capture the Doctor and Jamie McCrimmon. Vaughn used Packer as a means to persuade his enemies if they did not agree. Packer also took pleasure in violence on many occasions such as when he was enthusiastic to prevent the Doctor and Jamie from escaping.
After the Cybermen's invasion Vaughn was betrayed by the Cybermen and they no longer obeyed his or Packer's commands. Packer was killed by a Cyberman when futilly trying to shoot bullets at it.