Minor spoilers ahead for DC's Legends of Tomorrow, which debuts on The CW at 8 p.m. ET/PT on January 21, 2016.
There are plenty of Easter eggs that haven't been spotted yet -- and probably some I didn't even recognize during a short visit to the set of DC's Legends of Tomorrow back in October -- but there was one that I can talk about now.
Last week, The CW released a batch of preview photos from the first episode of Legends, along with character photos for many of the series' stars. Among them? Rip Hunter, standing in the warm light of his time lab...in front of one of the most recognizable helmets in comics.
There's what certainly appears to be the World War II army helmet of Sgt. Frank Rock of Easy Company in the glass case immediately to Rip Hunter's left in the photo above.
You can see Rock, alongside a slightly zoomed-in copy of the Hunter photo, below.
In the comics, Sgt. Rock was to DC what Nick Fury was to Marvel for a while. Rock, created in the late '50s, was one of a number of war heroes created for comics that had briefly rejected superheroes in the wake of Frederic Wertham's 1954 book Seduction of the Innocent, which led to widespread changes in the comics marketplace.
Sgt. Rock, the head of an eclectic and brilliantly effective World War II unit called Easy Company, became the most popular character in Our Army At War, to the point where eventually the comic was simply retitled to Sgt. Rock. He appeared regularly in comics from his creation in 1959 until 1988, when his solo title was cancelled, and has appeared periodically since. Depending on whose version you choose, Rock died in combat, lived to old age, became a general, or had a role in the Suicide Squad.
When DC launched their ambitious New 52 publishing initiative in 2011, Rock's grandson Joseph guest-starred in the short-lived Men of War.
There wasn't anything to specifically indicate that the helmet belonged to Sgt. Rock, but from the sort of things Rip Hunter collects in his similar lab in the comics? Well, it seems pretty likely.
What else can you see in Hunter's living quarters? Wait until DC's Legends of Tomorrow debuts in just over three weeks to find out.