The band has undergone several line-up changes, all overseen by founding members Scott Vogel (lead vocals) and Nick Jett (drums).

Its current lineup also features guitarists Martin Stewart and Jordan Posner, as well as bassist Chris Linkovich.

[8] Before Terror, vocalist Scott Vogel sang for Slugfest, Despair, and for Buffalo, New York-based metalcore act Buried Alive in the mid-1990s.

[9] Drummer Nick Jett and ex-lead guitarist Todd Jones were members of the well-known hardcore band Carry On (who had releases on Bridge Nine and Teamwork Records).

[16][17] Pre-orders for The 25th Hour were announced on June 30, 2015, along with the albums August 7 release date and a stream for the single "The Solution" which premiered exclusively on Noisey.

[21] These sessions saw the band reunite with founding lead guitarist Todd Jones, who oversaw production and contributed guitar parts.