After finally agreeing to testify before Congress last week, Facebook CEO Mark Zuckerberg heads to Capitol Hill Tuesday and Wednesday to answer for his company's recent troubles. Expect him to address Facebook's privacy policies, the Cambridge Analytica fiasco that ensnared the data of 87 million users, and Russia's repeated, ongoing efforts to use the platform to disrupt US democracy. And that's just for starters. Here's how to watch.

Zuckberg's testimony will take place in two chunks. Tuesday, he'll sit before before a joint hearing of the Senate Judiciary and Senate Commerce, Science, and Transportation committees, scheduled to start at 2:15 pm EDT.

On Wednesday, the House Energy and Commerce Committee gets a turn, kicking off at 10 am EDT.

If you're a few minutes late tuning in, no worries; the House committee already released his prepared testimony. It hits a lot of the same notes as his recent call with reporters, with a healthy dose of contrition thrown in. "It was my mistake, and I’m sorry," Zuckerberg wrote. "I started Facebook, I run it, and I’m responsible for what happens here."

The rest mostly provides a timeline of how Facebook got to this point, dating back to 2014, when researcher Aleksander Kogan created an app that 270,000 Facebook users installed, through which he accessed the data of up to 87 million. He then passed that data along to Trump-affiliated political data firm Cambridge Analytica, lighting a fuse that would go off years later. Zuckerberg will also detail how Russia's Internet Research Agency reached millions of Americans with its propaganda efforts, despite a relatively small amount of money spent on actual ads.