By Lynette Rice
Updated December 13, 2010 at 07:37 PM EST

Image Credit: Mitchell Haaseth/NBCMedium creator Glenn Gordon Caron promises “complete closure” when the CBS drama starring Patricia Arquette ends its seven-year run on Jan. 21. He also offers this exclusive teaser about the final episode, which began taping last week in Manhattan Beach, Calif: “It takes place in the present, it takes place seven years after that, and then it takes place 40 years after that.”

The entire ensemble will participate, but don’t look for surprise visits. “It’s not like Captain Push is coming back or anything,” says Caron, in reference to Arliss Howard’s character who was the first member of law enforcement to learn that Arquette’s character could foresee events and talk to the dead.

Something things had to occur in the finale, however. “We have to be intelligent, and we have to startle.”

Will he make fans sad, too? “I know for certain that people will tear up,” says Caron.

The creator confirmed via Facebook last month that CBS canned the drama. The network cut the episodic order on Medium from 22 to 13 in October. The drama averages 7.1 million viewers.