Dr. Burke Returns to Grey's, The iHeartRadio Music Awards, and More on TV Tonight

#BurkeIsBack, ya'll! Isaiah Washington revisits Seattle in a bound-to-be-emotional episode of Grey's Anatomy, Ken Marino and Bob Newhart make guest appearances, plus more to watch tonight on TV:

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The iHeartRadio Music Awards. 8pm on NBC. Rihanna, Drake, Justin Timberlake and other top artists will be honored at the first annual awards show, live from LA. Shakira and Pharrell will be performing!

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The Big Bang Theory. 8pm on CBS. Bob Newhart returns as Professor Proton, while the girls make a "Star Ways Day" gift for their male cohorts. Get it? Because Star Wars Day is May 4th?

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Grey's Anatomy. 9pm on ABC. Cristina must make a difficult decision about her future when the love of her life returns to Seattle in Sandra Oh's almost last episode ever.

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Bad Teacher. 9:30pm on CBS. Ken Marino guest stars as a student's dad who Meredith wants to date but can't because said student won't allow it.

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Portlandia. 10pm on IFC. Toni and Candace lead a feminist retreat in the season finale.

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Whatcha watchin' tonight? Tweet us @OKMagazine.