The end of Guardians of the Galaxy Vol. 2 featured a nod to the Guardians of the past, bringing together Stakar Ogord (Sylvester Stallone), Charlie-27 (Ving Rhames), Aleta Ogord (Michelle Yeoh), Krugarr (currently uncast), Martinex (Michael Rosenbaum) and Mainframe (Miley Cyrus). Concept art for Martinex and Krugarr has already surfaced, but now Jackson Sze, a senior illustrator at Marvel Studios, has released early ideas for Mainframe.

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All three designs differ fairly substantially from what's seen in the Marvel sequel. In one of the accompanying Instagram posts, Sze notes that Tully Summers, who worked as a concept artist on The Dark Knight Rises, created the final design.

Describing the first image, Sze calls it a "silly retro design option for Mainframe," which seems quite apt, as it looks as if it would be at home in a classic sci-fi film like Star Wars.

The second option looks sleeker and seems at least partially inspired by the robot designs in the Super Sentai series, which inspired Power Rangers and a number of other shows.

The most recently posted design is a bit more patriotic, with Sze adding, "something Red, White, and Blue for 4th of July. Another Mainframe option! #gotgvol2 #marvelstudios #conceptart."

Nearing the completion of its theatrical release, director James Gunn's Guardians of the Galaxy Vol. 2 stars Chris Pratt as Star-Lord, Zoe Saldana as Gamora, Dave Bautista as Drax the Destroyer, Vin Diesel as Baby Groot, Bradley Cooper as Rocket Raccoon, Michael Rooker as Yondu Udonta, Karen Gillan as Nebula, Pom Klementieff as Mantis, Elizabeth Debicki as Ayesha, Chris Sullivan as Taserface, Sean Gunn as Kraglin, Glenn Close as Irani Rael and Kurt Russell as Ego.