By Natalie Abrams
September 24, 2014 at 03:32 PM EDT

While fans were geeking out over seeing Peggy Carter (Hayley Atwell) and the Howling Commandos in the Agents of S.H.I.E.L.D. premiere, they may have missed a major tease at what’s to come during the first five minutes of the episode.

After Agent Carter & Co. take down Daniel Whitehall’s (Reed Diamond) Hydra outpost in the ‘40s, the SSR packs up various boxes, including the 0-8-4 at the center of the episode in present day, an obelisk that eventually claims the life of Isabelle Hartley (Lucy Lawless).

Moments prior, however, Dum Dum Dugan (Neal McDonough) takes a peek inside a different box before Carter quickly closes it. If you look closely, we got a blink-and-you’d-miss-it look at what appears to be a blue alien within the box. Could this be the very same blue alien that eventually brought Coulson (Clark Gregg) back to life? And will we see this box again?

“I think you know us well enough to know that we don’t put anything there by accident,” executive producer Jeph Loeb told EW at a press screening of the first two episodes of the ABC series on Tuesday night. Added executive producer Maurissa Tancharoen: “It’s not just for kicks.”

Here’s the box in question:

And here’s the alien we saw last season:

The powers that be behind S.H.I.E.L.D. have remained notoriously mum on the identity of the blue alien’s race since it first appeared last season. What is known is that the organization had been housing the blue alien, whose regenerative blood was used to bring Coulson back to life, in a facility that self-destructed when Coulson’s team set foot inside.

“I know that as a Marvel fan, when I went to see Guardians of the Galaxy, there was a very similar blue fellow named Ronan the Accuser [Lee Pace],” Gregg recently told EW for our Fall TV Preview issue. “I thought, ‘Oh, perhaps this looks Kree.'”

It should come as no surprise then that Gregg was very punny after EW inquired into the blue alien on Tuesday night. “That’s amazing that you picked up on that,” he said. “That’s un-kree-lievable.”

Agents of S.H.I.E.L.D. airs Tuesdays at 9 p.m. ET on ABC.