Sam Bankman-Fried is poised for a high-stakes showdown on Monday, as prosecutors prepare to grill a key witness in a closely watched financial inquiry.

The atmosphere in the committee chambers is expected to be nothing short of intense, as senators are set to ask tough questions regarding alleged financial misconduct.

Adding to the intrigue, a mysterious rebuttal witness is slated to appear immediately after the grilling session.

Prosecutors also hinted Friday that they then plan to call a “rebuttal” witness after he leaves the stand.

“We are expecting a brief rebuttal case,” a member of the federal prosecution team told Judge Lewis Kaplan after jurors were sent home for the day.

Little is known about this enigmatic figure, leaving both the committee and the public watching on.