"Having seen it, I can tell you that [fans] are going to react appropriately awestruck and amazed," Gad told ET's Lauren Zima at the Children's Hospital Los Angeles Once Upon a Time Gala on Saturday.
In the upcoming Beauty and the Beast, Gad plays the conniving Le Fou, the mindless lackey of Luke Evans' villainous Gaston. While he may play the Beast's on-screen enemy, Gad had nothing but praise for co-star Dan Stevens, who plays the film's eponymous hirsute hero.
"Dan's performance is just incredible," Gad, 35, marveled. "[He] gives it a gravitas that I think just grounds the entire movie."
Stevens stars opposite Emma Watson, who plays the iconic Disney princess Belle.
Gad went on to say that the upcoming live remake isn't looking to replace the beloved original, but rather "builds on the animated classic."
"It evolves [from the original], like Jungle Book evolved from the source material, like Cinderella evolved from the source material," Gad shared. "But it goes further into the trenches in terms of the mythology and in terms of the characters."
"There's a scope to it and a pathos to it that, having seen it, I can tell you was unexpectedly very emotional," he added. "It's just going to blow everybody away."
Beauty and the Beast, which also stars Ewan McGregor, Emma Thompson, Ian McKellen, Stanley Tucci, Kevin Kline and Audra McDonald, hits theaters March 17, 2017.