On Thursday's new episode of The Big Bang Theory "The Geology Elevation," Howard (Simon Helberg) rediscovers an old Stephen Hawking action figure he made. The toy is a model of the ALS-stricken physicist in his wheelchair that Howard attached to the motor of a remote controlled car. Pretty tasteless, Mr. Wolowitz!

TVGuide.com has your first look photos of Howard's RC Hawking. He and Raj (Kunal Nayyar) are showing the model to their colleague Barry Kripke (John Ross Bowie), who's making his first Season 10 appearance in the episode.

Kunal Nayyar, Simon Helberg and John Ross Bowie, <em>The Big Bang Theory</em>Kunal Nayyar, Simon Helberg and John Ross Bowie, The Big Bang Theory

Kunal Nayyar, Simon Helberg and John Ross Bowie, <em>The Big Bang Theory</em>Kunal Nayyar, Simon Helberg and John Ross Bowie, The Big Bang Theory

Oh, and Stephen Hawking isn't just appearing in toy form. The Brief History of Time author will make his fourth appearance on The Big Bang Theory in the episode as well.

Simon Helberg,<em> The Big Bang Theory</em>Simon Helberg, The Big Bang Theory

Elsewhere in "The Geology Elevation," Sheldon (Jim Parsons) is overcome with jealousy when his geologist friend Bert (Brian Posehn) is awarded a MacArthur Fellowship, aka the "Genius Grant."

The Big Bang Theory airs Thursdays at 8/7c on CBS.

(Full disclosure: TVGuide.com is owned by CBS.)