Mark Ratner was born on April 24, 1980 in San Diego, CA. He is a kind and nerdy engineer who "just loves math."
It is revealed in "Chuck Versus the Cougars" that he attended James Buchanan High School in San Diego in the same graduating class as Heather Chandler and Sarah Walker, who was then using the pseudonym Jenny Burton. He had participated with Sarah in several high school activities: AV Club, Chess Team, and Mathletics.
In the end it is revealed that his wife, Heather, is attempting to sell the plans to the Russian mob simultaneously, and orders that two mobsters at the high school reunion kill both Chuck - who was using the pseudonym Charles Carmichael - and Ratner.
Ratner believes that Chuck is actually Charles Carmichael, an CIA special agent, after he was saved multiple times by Casey, who quickly left, leaving Chuck with the bodies, leading Ratner to believe Chuck is the only CIA agent he's dealing with.
The bad guys arrived and are alerted by Heather, who is working with the Russians, about Chuck being a spy, having overheard a conversation between him and Mark. Chuck urges Mark to run, while he points out the two men to Sarah and Casey.
Sarah notices Heather leaving the gym and follows, and fights Heather, learning that she is selling out her husband; she never really loved Mark.
Casey stops the Russians from killing Mark; although Mark thought Chuck saved him once again.
He shares his name with the nerdy Mark Ratner (Brian Backer) in Fast Times at Ridgemont High, while the alma mater shares its name with the Sweathogs' high school in the television series Welcome Back, Kotter.
|See Also: Minor Characters • Season One Characters • Season Three Characters • Season Four Characters • Season Five Characters|