The Big Bang Theory: The Fortification Implementation Previews Released

CBS has released new preview clips of tonight's The Big Bang Theory episode, which sees both Kevin Smith and Matt Bennett guest star. 

In "The Fortification Implementation," Wolowitz finds a stranger on his doorstep who claims to be his half-brother (Bennett). As Wolowitz reconnects with his estranged sibling, Sheldon and Amy try building a blanket fort while Sheldon and Penny have massive argument on Wil Wheaton's podcast. It seems like the geek stars have literally aligned for this episode, no?

You can check out the preview clips below.

The Big Bang Theory airs tonight at 8:00 p.m. on CBS.