Entertainment Weekly reports that William Sadler, Anna Chlumsky and brothers Danny and Christopher Masterson will appear in the second episode of the show's third season.
'Where There's a Will' will focus on the case of a forged will that is revealed to be a secret treasure map.
That '70s Show actor Danny Masterson and Malcolm in the Middle's Christopher Masterson will play two brothers who uncover the conspiracy when they contest their father's will.
Sadler will play a security consultant who becomes involved in a kidnap plot. The actor has appeared in such films as The Shawshank Redemption and The Green Mile, while his recent television credits include roles in Hawaii Five-0, The Pacific and Criminal Minds.
My Girl star Chlumsky will play a rookie FBI agent who teams up with Neal (Matt Bomer) and Peter (Tim DeKay). She recently played Charlie on recently-axed FX drama Lights Out and has also appeared on Covert Affairs and Law & Order.
White Collar will return to USA on June 7.
> White Collar exec teases third season