2012 TV series and season finales

8 p.m.

'Shark Tank' season finale (ABC)
'Nikita' season finale (The CW)
'Who Do You Think You Tare?' season finale (NBC)

9 p.m.

'Supernatural' season finale (The CW)
'Grimm' season finale (NBC)
'Degrassi: The Next Generation' season finale (TEENNICK)