Burn Notice, the hit tv series about blacklisted spy Michael Westen (Jeffrey Donovan), shows no sign of cooling down on the eve of its third season finale.

It’s no surprise that the series is already gearing up for a fourth season after drawing an all-time high of 6.8 million viewers during last week’s episode, according to the network.

The finale, “Long Way Back”, involves a dangerous man from Fiona’s (Gabrielle Anwar) past that shows up in Miami after years of hiding. Michael (Donovan) teams up with Fiona’s ruthless brother to save her even if it means crossing a few lines.

Co-star Bruce Campbell, who plays Michael’s closest friend and ex military intelligence contact “Sam Axe,” said he thinks the show will stay on for a while.

“We’ll go at least eight [seasons] — Monk did eight and we’re outpacing them in ratings” compared to Monk’s third season, Campbell said in a conference call Tuesday. “Admittedly, I have to say, I’m not looking over my shoulder. I’m fully prepared to drive this show to the bitter end.”

Campbell said the show’s success is based on the “hybrid” nature of giving the right amount of familiarity with each episode combined with a little progression towards Michael’s quest to find the man who burned him.

“You want to hang with Michael, Fiona, and mom to see what adventures they get into every week yet, at the same time there is a constant progression,” he said.

Emmy Award-winning actress Sharon Gless who plays Madeline, Michael’s chain-smoking, worrisome mother, was also on the conference call shedding light onto her own performance.

“I think Maddie is starting to trust more,” Gless said, citing a previous episode where she successfully interrogated a man for the whereabouts of her son. “It’s not often that I get to 1-up Bruce Campbell in interrogation.”

While both actors admitted to not knowing the future of their characters prior to reading each script (nor did they want to), they did discuss a few things that will show up in season four.

In one episode Michael gets into some ethically questionable territory that Sam refuses to help with, Campbell stated.

“Michael is going to get in real deep,” he added.

Also confirmed for next season is a guest appearance by Gless’ former Cagney and Lacey Co-star Tyne Daly.

The Burn Notice finale airs Thursday, Aug. 6 at 9 p.m. EST on the USA Network and the second half of the season will return this winter.

[Video] – Season 3 Finale Teaser