"Yeah, absolutely not. It would be so different," Bassett, who has played Athena since the show's 2018 premiere, tells PEOPLE. "I don't even know what the show would be like without them together. It's hard to imagine."

The honorary Academy Award winner, 66, notes that the twosome are "your metaphorical, weekly mom and dad" as she adds, "We'll keep you safe."

Related: Joshua Jackson Says Working with Angela Bassett Was on Bucket List for 'Years' Before 9-1-1, Doctor Odyssey Crossover (Exclusive)

Bassett's Athena, an LAPD patrol sergeant, began dating LAFD Station 118 captain Bobby, played by Peter Krause, at the end of season 1. The characters eventually wed in season 2 and have remained an anchor for the show ever since.

The Black Panther actress' bond with Krause, 59, extends beyond the ABC procedural, as the two have developed a close friendship offscreen as well.

Praising the Parenthood alum, Bassett says: "He's just so strong, and stable, and secure."

"He's just calm. He's just a calming influence," she continues. "He'll joke a little bit, but he don't mind being the butt of the joke. Yeah. So he'd always have one."

Recently, Bassett's Athena stepped away from her home at 9-1-1 to board Doctor Odyssey for a special crossover episode. Per a synopsis of the episode titled "Casino Week," Athena spotted "two suspicious passengers eyeing the vault" and then teamed up with Max (Joshua Jackson) to "counter their plans in a high-stakes gamble."

"It was just a love fest. It was certain times I had to, with the guys especially, I would have to walk away, center myself because they have so much wonderful energy and so much to say," she adds. "They are just such a delight."