Hawaii Five-0
The 150th episode of Hawaii Five-0 will feature Catherine's return.Facebook/Hawaii Five-0

Season 7 of Hawaii Five-0 has been enjoying good ratings since its premiere on September 23, but its lead actor Alex O'Loughlin, who plays Steve McGarrett, has already started thinking about his departure.

O'Loughlin, 40, recently told TVLine that he intends to leave the show after a potential Season 8. Hawaii Five-0 is a police procedural drama that requires O'Loughlin to take part in intense action scene, which might prove difficult as years go by.

"I'm just trying to make it through the end of [Season] 7!" said O'Loughlin. "[Five-0] is really, really wonderful, but it is an action show, I'm the main guy, and I defy anybody to do what I've done for as long I've done it and hold out the way I have. Dude, I was a fit, strong, healthy guy when I started the show, and I still am, but you sustain what you sustain. It's part of the gig."

This Friday's episode of Hawaii Five-0 will be the show's 150th where McGarrett will be reunited with his mother Doris as well as his ex girlfriend Catherine. McGarrett's current girlfriend Lynn will also be present in this episode, and it will put him in an awkward position when his past and present meet.

Elsewhere in the episode, viewers will see Chin's efforts to stall Sara's adoption and Grover and his son taking part in an intelligence gathering operation. Sadly, Danny will not be a part of this milestone episode as he will be away tending to his father, who is in the hospital.

Hawaii Five-0 airs Fridays on CBS.