Legends of Tomorrow's Legion of Doom Headquarters Looks Mighty Familiar

Meanwhile, at the Hall of Doom, "Legends of Tomorrow's" Legion of Doom has used the Spear of Destiny to create their own reality -- and that reality includes a big nod to the 1973 "Super Friends" cartoon from Hanna Barbera.

On his Twitter, executive producer Marc Guggenheim unveiled the establishing shot for "Doomworld," the penultimate episode of Season 2. The photo shows a structure not unlike STAR Labs; however, the building has a rounder shape with concave windows, making it look almost like a helmet... much like the Hall of Doom from "Super Friends."

RELATED: Heroes Go Evil as Reality is Rewritten in Legends of Tomorrow Trailer

Of course, "Legends of Tomorrow's" Hall of Doom is a much more modern, updated take on the original 1973 design (below). For one, this Hall of Doom isn't in a swamp; additionally, the helmet-like look isn't quite as blatant. Nevertheless, there are certainly parallels between the two.

RELATED: Legends of Tomorrow Reveals How Captain Cold Came Back

This isn't the first time that the "Arrow"-verse has called back to "Super Friends." During the four-show DCTV crossover back in November, Team Flash uncovered a STAR Labs hangar that looked suspiciously like the Justice League's Hall of Justice in the animated series.

Debuting in the late 1970s, “Super Friends” united heroes like Superman, Batman, Wonder Woman and Aquaman; together, they fought to put an end to the Legion of Doom, a group of super villains that made their live-action CW debut in “DC’s Legends of Tomorrow.”

RELATED: Legends of Tomorrow Face Ultimate Consequence In Season Finale Synopsis

According to the official synopsis for "Doomworld," the penultimate episode of Season 2,

BETRAYALS – After obtaining the Spear of Destiny, the Legion of Doom rewrites reality, leaving the Legends changed, perhaps forever. Frightfully, the Legends’ and the world’s hope rests with Rory (Dominic Purcell), but being the “hero” is not easy for him. Meanwhile, there is tension within the Legion of Doom and the reason why the Spear of Destiny needs to be destroyed is revealed. Victor Garber, Brandon Routh, Arthur Darvill, Caity Lotz, Franz Drameh, Nick Zano and Maisie Richardson-Sellers also star. Mairzee Almas directed the episode written by Ray Utarnachitt & Sarah Hernandez.

Airing Tuesdays at 9 pm ET/PT on The CW, “DC’s Legends of Tomorrow” stars Brandon Routh as the Atom, Victor Garber and Franz Drameh as Firestorm, Caity Lotz as White Canary, Maisie Richardson-Seller as Vixen, Dominic Purcell as Heatwave and Nick Zano as Citizen Steel.

Star Wars Lifts the 'Spoiler Ban' on The Mandalorian's 'Asset'

More in TV