This week on Smallville...

... Tess breaks into Watchtower, causing an elaborate security system to go off, trapping her and Chloe inside. 

... Clark discovers that Zod has given his soldiers some seriously awesome powers.

... Oliver confronts Zod , only to end up in the hospital.

The clip below, courtesy of "Sacrifice," focuses on the latter confrontation. For more information on what's ahead, including season finale scoop, visit our Smallville spoilers section.

[video url="http://www.tvfanatic.com/videos/sacrifice-clip/" title="Sacrifice Clip"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.