He is voiced by Liam O'Brien.
Dimitri is a scientist that worked for a long time on a time machine with Claire and Bill Hawks. Dimitri was the only one to notice the fatal flaw, but Bill ignored him and went on with the presentation. This caused an explosion that killed as many as 10 people, which included Clive's parents and Claire herself. When he discovered the Claire was shot 10 years into the future, he found that her molecular stability was too weak due to part of her remaining in the past, and was trying to return to the moment of the blast. Dimitri tried everything he could to stabilized, but Claire tried to stop him.
Due to the dangers and the problems already caused by his research, he decided to halt his efforts to save Claire and "close the book on the time machine... forever". Then Claire finally returns to the past when the blast occured, and ultimately died.