We’ve seen it and we’re telling you: Warehouse 13 fans, it’s a big episode tonight. Since Season 4 is a longer season – 20 episodes instead of the usual 12 – the season is split in half, with the first half concluding tonight, and the second half premiering in Spring 2013.

Given what happened at the end of last week’s episode, it should come as no surprise that there is little humor this week, but after that we’ll say no more, other than to tell you that it is definitely an important episode that you need to watch before someone spoils you. It will not be us. We’ll just show you this TV spot, which is the same thing they showed at the end of last week’s episode:

TV Spot: Warehouse 13 – We All Fall Down
[youtube]http://www.youtube.com/watch?v=uwudI3AMSIA&hd=1[/youtube]

Warehouse 13, starring Joanne Kelly, Eddie McClintock, Saul Rubinek, and Allison Scagliotti, airs its Midseason Finale tonight, October 1, at 9/8c on Syfy.