heroes brave new world

Here's a look at tonight's sci-fi TV:

Heroes, "Brave New Word" – The Heroes season finale could turn out to be a series finale thanks to tanking ratings (not to mention the show's dip in quality). Season four's final act sees Samuel taking revenge on humanity with the ultimate weapon ... a deaf girl's cello! The producers are promising a game-changing finale that will shock all 25 die-hard fans to the core. Oh, and Sylar officially becomes a good guy, again. (9 p.m. ET on NBC)

Chuck, "Chuck Versus The Mask" – It's team-up time as Morgan pairs with Elle to find out Chuck's secret, and Sarah and Shaw work together on a mission involving cute nerd couple to be (I hope) Chuck and Hannah. (8 p.m. ET on NBC)

Head after the jump for clips and more TV picks.

Heroes clips:





Chuck clips:




Reruns:
- Ghost Whisperer (Mini-marathon starting at 7 p.m. ET on Syfy)

- Moonlight (8 p.m. ET on Chiller)

- Futurama (Two episodes starting at 9 :30 p.m. ET on Comedy Central)

Movies:
- Armageddon (7 p.m. ET on FX)

- Dragonball: Evolution (10 p.m. ET on Cinemax)

Check your local TV listings for more.