The Five Doctors

A Doctor Who text adventure based on a story by Terrance Dicks.
"It is as though great chunks of your past are detaching themselves like melting icebergs. The Time Scoop is being misused to transport you and your other selves from their proper places in Time and Space to the Death Zone on Gallifrey. Someone is using you to secure the famous Ring of Rassilon on their behalf...
Your aims as Doctor are to become "whole" again by joining with all of your other selves, including your fourth self who is trapped in the Vortex, and discover the identity of who or what is misusing the Time Scoop."