On April 17, 2018, as Sanity was called up to SmackDown during the 2018 WWE Superstar Shake-up, it was revealed that Cross would be staying on NXT as a singles competitor, thus splitting her from the group.

According to original member Sawyer Fulton, Sanity's concept came from Triple H, who was inspired by the film Smokin' Aces, "long before 2016".

"[1] The concept was brought back after Fulton was randomly paired up with Alexander Wolfe in a match against the Hype Bros at a live event, as the two enjoyed working with each other.

[1] After a series of cryptic vignettes teasing the stable, it was announced on October 4, 2016, that "Sanity" would be part of the second annual Dusty Rhodes Tag Team Classic tournament, although the nature of the group and the identity of its members remained anonymous.

[17] At NXT TakeOver: Chicago, Young suffered his first pinfall defeat to Roderick Strong whilst Nikki Cross once again failed to win the women's title in a triple threat match against Asuka and Riott.

[21] Following the celebration, they were attacked by Bobby Fish and Kyle O'Reilly, who formed the new stable The Undisputed Era with Adam Cole later the same night.

On the September 20 episode of NXT, Sanity helped Drew McIntyre against The Undisputed Era, thus turning the stable face in the process.

[27] On the April 17, 2018 episode of SmackDown Live, a vignette aired to promote Sanity's debut as part of the 2018 WWE Superstar Shake-up.

On June 19, Sanity made their debut on SmackDown Live beating down The Usos prior to their scheduled tag match, turning back to heels.

On the April 2, 2019 episode of SmackDown Live, all three members of Sanity were defeated by The Miz in a handicap falls count anywhere match.

On October 8, 2022, Eric Young and Axel Tischer reunited as Sanity to compete in Westside Xtreme Wrestling's wXw World Tag Team Festival.