'Hawaii Five-0' season 7 spoilers: Guest stars for upcoming episodes revealed

Episode 20 of "Hawaii Five-0" is set to air on March 31. However, some news outlets have reported that the upcoming episodes will be bringing quite a few guest stars.

One of them is a familiar face. Julie Benz, who plays Abby, will be returning for the season finale of the show to help the team bring down a human trafficking ring, which was featured in episode 19.

Lori Petty from "Orange is the New Black" is also set to make a guest appearance, according to Entertainment Weekly. She will play Jenny Kitson, a nurse who is looking after a John Doe, a comatose patient who turns out to be a possible witness in a case handled by Danny (Scott Caan) before he joined the Five-0 team. She will find herself working with the police officer to protect John Doe.

Emmy winner and Oscar nominee Hal Holbrook will also be appearing on the show. He will be playing a war veteran who survived the Pearl Harbor attack. His character is a colleague of Steven McGarett Sr., Steve's (Alex O'Loughlin) grandfather, and he will be key to the head of the Five-0 team discovering more about his kin. Holbrook's character will not be the first colleague of McGarrett's grandfather shown on screen. In Season 1, Robert Loggia played the role of a retired sailor who worked with him in Arizona.

The season 7 finale of "Hawaii Five-0" is expected to be an event-filled one. O'Loughlin has confirmed that he will be leaving the show, so it is highly likely that he will be given a dramatic exit. There are also rumors that Caan's character, Danny, will retire by the end of the season. Masi Oka, who played Dr. Max Bergman, left the show last January.

"Hawaii Five-0" airs every Friday night at 9 p.m. EDT on CBS.