The Flash TV series has reached its 100th episode, with the show set to hit its centenary with the 8th instalment of season 5. The episode will be entitled What’s Past Is Prologue, and we have the teasing synopsis right here.

It’s something of a tradition that landmark episodes like this will feature blasts from the past, calling back to the show’s previous storylines and characters. This episode will follow that 100th episode formula to a tee, by the sounds of this synopsis…

“In the 100th episode, Barry (Grant Gustin) and Team Flash come up with a plan to stop Cicada (Chris Klein). However, the plan calls for Barry and Nora (Jessica Parker Kennedy) to travel back in time to gather some key necessities. However, Barry hesitates, concerned about his daughter seeing certain parts of his life. Meanwhile, Sherloque (Tom Cavanagh) takes his concerns about Nora to Iris (Candice Patton), and Caitlin (Danielle Panabaker) turns up a key asset in the fight against Cicada.”

TV Line reports that Zoom, the big bad of season 2, will be returning in the episode – with Tony Todd coming back to voice the role. Will the Reverse-Flash, Savitar and the Thinker get to make an extra appearance as well? We’ll just have to wait and watch to find out.

The Flash airs on Sky One in the UK and is available on Now TV for catch-up purposes.