Can someone give any good ideas for video games in a time travel theme?

Check out Darkest of Days on Xbox 360 and Pc.

In Darkest of Days the player controls Alexander Morris, a soldier fighting in General Custer's battalion during the Battle of Little Big Horn at the beginning of the game. After Custer is killed and Morris is wounded he is suddenly rescued by a man in futuristic armor and taken through a strange portal. Morris then awakens in the headquarters of Kronotek, an organization that has managed to develop time travel technology and is apparently dedicated to researching and protecting history. A Kronotek higher-up known as "Mother" tells Morris that Doctor Koell, the organization's founder, has gone missing and disturbances have started appearing through history, causing individuals that have played key roles in history to be placed in danger, and tasks Morris with helping Kronotek restore history.