The Skinny on the Looming Season Finales

Here are some of the recently confirmed dates for upcoming season finales as we approach May rating sweeps. And check out these guest stars! It's like a sci-fi convention.

• April 27 - Chuck (NBC) "Chuck Versus the Ring" (2x22). In the Season 2 finale, Ellie and Awesome's wedding day arrives, but Chuck must spring into action to save his sister from evil Fulcrum forces and one Ted Roark (Chevy Chase). Guest stars include Scott Bakula, Morgan Fairchild, and Bruce Boxleitner.
• April 27 - Heroes (NBC) "An Invisible Thread" (3x25). Nathan takes on Sylar in order to shield the president (Michael Dorn) in the third-season finale. Elsewhere, Hiro discovers unexpected side effects from recovering his ability, and Matt takes extreme measures to protect his family.
• May 8 - Dollhouse (Fox) "Omega" (1x12). The Season 1 finale finds Alpha's Echo obsession growing ever more dangerous, Ballard's search for the Dollhouse coming to a conclusion, an Active being permanently deactivated and another's surprising past coming to light. Stephen Kepler: Alan Tudyk (Wash from Firefly).
• May 12 - Fringe (Fox) "There's More Than One of Everything" (1x20). Someone with close ties to the Fringe Division is suddenly and unexpectedly attacked. ZFT bioterrorist David Robert Jones (Jared Harris) returns and Walter appears to be missing. The season finale guest stars Leonard Nimoy as Dr. William Bell.
• May 15 - Ghost Whisperer (CBS) "The Book of Changes" (4x23). Melinda's dreams and visions about her baby tie in with a mysterious book that everyone wants to get their hands on. Melinda hopes she can protect her baby after a ghost visits her. Guests include Bruce Davison and Charisma Carpenter.
• May 26 - Reaper (The CW) "The Devil & Sam Oliver" (2x13).

The finale for Medium is set for June 1.