The Walking Dead: All the Breaking Bad references supporting fan theory they’re set in same world

Did Walt and Jesse cause the zombie apocalypse?

It’s long been suspected that Breaking Bad is set in the same world as The Walking Dead.

The latest episode of the zombie series’s ninth season fuelled this theory – popularly known as “The Breaking Dead Theory” – with yet another reference to Vince Gilligan’s drama.

It came courtesy of new character Lydia (Cassady McClincy) in episode 10, which is titled “Omega” (catch up on its five biggest talking points here).

Lydia tells Daryl (Norman Reedus) and Henry (Matt Lintz) about her troubling backstory, which viewers see in flashbacks dating right back to the zombie outbreak.

They serve to show how her mother, the show’s new villain played by Samantha Morton, went from caring mother to terrifying walker skin-wearing maniac, Alpha.

Breaking Bad die-hard fans will remember this song very well. It’s the tone that rings when drug distributor Lydia Rodarte-Quale (Laura Fraser) calls creepy Todd (Jesse Plemons) in the series finale.

Scroll through the below gallery to see all the Breaking Bad references to have featured in The Walking Dead and its spin-off Fear the Walking Dead.

Are they set in the same universe? You decide.

You can find a rundown of the show's 15 most controversial moments here.