The new ten-part run - subtitled Vengeance - will see the Australian actor replace the late Andy Whitfield in the lead role.
"It's everything you love about the show, but it's bigger," he told Collider. "There's all the blood, the guts, the sex, the violence, the intrigue, the back-stabbing, the double-cross and all that, and that's all ramped up because the stakes are so much higher.
"Any wrong decision ends in death, and they just find a way to push that, further and further. Now, it's not a battle against the small world, it's a battle against the whole world."
McIntyre also insisted that he did not intend to "mimic" his predecessor Whitfield in taking on the role of Spartacus.
"Season one is his Spartacus, and it's amazing," he said. "I don't think anyone would want me to mimic him, in some way. Ultimately, that would just be a shadow of Andy's Spartacus.
"The responsibility I have is to try to capture that same essence and make it my own. That's hard, but more realistic than trying to copy someone who's done it so well."
Spartacus: Vengeance begins on Friday, January 27 at 10/9c on Starz. The show has already been renewed for a third season.
> Liam McIntyre on next season: 'Spartacus has to learn to be a leader'
Watch the opening scene from Spartacus: Vengeance below: