And so, the countdown begins.

The two-hour series finale of the much-celebrated sci-fi drama Battlestar Galactica, in its fourth season, is fast approaching. The final episode will air on Friday, March 20 (9 p.m. ET on SPACE).

The cast includes Canadian actors Tricia Helfer (The Green Chain), Grace Park, Tahmoh Penikett, and Aaron Douglas.

Of the filming of the conclusion, "Daybreak", Helfer, who plays Number Six on the show, was quoted in a press release as saying "Everyone reacted differently…some people cried, I felt like I was punched in the stomach."

During its run, the series has garnered critical acclaim, including four Emmy awards.

Meanwhile, a BSG spin-off, Caprica, is in the works and includes a large number of Canadian actors in its cast.