Pack up the beakers and Bunsen burners, stop worrying about atomic weight and absolute temperature – it’s time for “The Nerdist“ on BBC America!

Tonight, Chris Hardwick welcomes heartthrob Jon Hamm from “Mad Men,” and the very talented Betsy Brandt from “Breaking Bad.”

Join us as Matt and Jonah attempt to write a mash up script of both their shows, and enlist a little surprise help from “Mad Men” actor Rich Sommer – aka Harry Crane – to give it that extra oomph!

All this plus comedian Rory Scovel and “Doctor Who” alum, Arthur Darvill, joins the fun tonight, on “The Nerdist.”