"wvrdr_error_100 not found" is the third episode of the seventh season of the American science fiction television series Legends of Tomorrow, revolving around the eponymous team of superheroes and their time traveling adventures.

They are joined by other principal cast members Caity Lotz, Tala Ashe, Jes Macallan, Adam Tsekhman, Shayan Sobhian, and Nick Zano.

Several former series regulars return including Brandon Routh, Victor Garber, Franz Drameh, Arthur Darvill, Courtney Ford, Wentworth Miller, and Falk Hentschel.

They are then sent back to the early days of the Legends where Gideon prevents a fight between Sara Lance, Ray Palmer, Carter Hall, and Leonard Snart.

[6] Main cast members Caity Lotz as Sara Lance / White Canary, Tala Ashe as Zari Tarazi, Jes Macallan as Ava Sharpe, Olivia Swann as Astra Logue, Adam Tsekhman as Gary Green, Shayan Sobhian as Behrad Tarazi, Lisseth Chavez as Esperanza "Spooner" Cruz, Amy Louise Pemberton as Gideon, and Nick Zano as Nate Heywood all return to star in the episodes from previous seasons.

[4] Many former main cast members return as guest stars; including Brandon Routh as Ray Palmer / Atom, Victor Garber as Martin Stein, Franz Drameh as Jefferson Jackson, Arthur Darvill as Rip Hunter, Courtney Ford as Nora Darhk,[7] Wentworth Miller as Leonard Snart / Captain Cold,[6] and Falk Hentschel as Carter Hall / Hawkman.

[8] Routh returned for the episode, explaining that when he exited the series as a regular, it was a bad decision, while adding as a reason the need to show a more mature version of the character.

[9] Klemmer said he was interested in Ciara Renée, Dominic Purcell and Casper Crump reprising their roles as Kendra Saunders / Hawkgirl, Mick Rory / Heatwave and Vandal Savage, but ultimately did not cast them.

Club said the episode "does not explore the full spectrum of Legends' trajectory – moments from the middle seasons are left relatively dry – buts it's still a touching tribute to how Gideon and the crew have affected one another", and gave it a B+ rating.