The best episode written by Todd Helbing is "What's Past Is Prologue", rated 8.5/10 from 21 user votes. It was "directed by Tom Cavanagh". "What's Past Is Prologue" aired on 12/4/2018 and is rated 0.2 point(s) higher than their second highest rated, "Out of Time".
Barry and Team Flash come up with a plan to stop Cicada. However, the plan calls for Barry and Nora 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 takes his concerns about Nora to Iris, and Caitlin turns up a key asset in the fight against Cicada.
Director: Tom Cavanagh
Writer: Todd Helbing
Mark Mardon, having survived his apparent death during the black-matter explosion, returns seeking revenge on Joe for the death of his brother Clyde... and has the same weather-manipulation powers as his deceased sibling.
Director: Thor Freudenthal
Writer: Todd Helbing
When a nuclear bomb detonates in downtown Central City, Barry, Jesse Quick and Jay Garrick slow down time by entering Flashtime. As everyone in the city is frozen, the three speedsters push themselves to the breaking point to save the city and everyone in it.
Director: Gregory Smith
Writer: Todd Helbing
When Harrison activates the particle accelerator, the team has no choice but to evacuate the five metahuman prisoners. Unfortunately, with time running out, Barry has no choice but to turn to Captain Cold for help. Meanwhile, Eddie escapes but has some surprising news for Iris.
Director: Douglas Aarniokoski
Writer: Todd Helbing
Barry enjoys the annual tradition of tree trimming and gift exchange with Joe and Iris. He gives Iris a touching gift, but the moment is interrupted by Eddie’s arrival.
Director: Ralph Hemecker
Writer: Todd Helbing
In an ironic twist of fate, a gladiator from the house of Batiatus will stand in the way of Spartacus trying to free Crixus from Roman captivity. Ilithyia's scheming puts her marriage to Glaber at risk.
Director: Rick Jacobson
Writer: Todd Helbing
When Lt. Sonya Blade calls in a report that she has tracked down Kano, "Jax" Briggs convinces his superior, Kurtis Stryker, to take in a squad of men, only to discover that it's a trap.
Director: Kevin Tancharoen
Writer: Todd Helbing
Beautiful, athletic, and trained as highly skilled assassins, Kitana and Mileena have grown up thinking that they are sisters. Shao Kahn, Emperor of the Outworld, has tricked Shang Tsung into becoming his servant for Mortal Kombat by making him clone Mileena as a Tarkatan clone of Kitana, out of Shao Kahn's fear that Kitana wouldn't love him enough if she ever found out the truth about her Mother and Father.
Director: Kevin Tancharoen
Writer: Todd Helbing
The rivalry between Kitana and Mileena grows, while Kitana attempts to learn the truth behind her childhood and the real identity of her parents.
Director: Kevin Tancharoen
Writer: Todd Helbing
Batiatus purchases a fresh batch of slaves during an auction to be trained as gladiators and ponders the idea of selling Crixus.
Director: Rowan Woods
Writer: Todd Helbing
While adjusting to their new lives in Smallville, Lois and Clark make an important decision concerning one of their sons. Meanwhile, tensions begin to rise between Lois and Morgan Edge. Lastly, Lana Lang Cushing invites the Kent family over for a barbecue.
Director: Lee Toland Krieger
Writer: Todd Helbing
After the shocking revelation that Zoom is Jay Garrick, Barry is more determined than ever to get back to Earth-2 to stop Zoom forever. Desperate to find a way to increase his speed, Barry decides to travel back in time and masquerade as his earlier self in order to get his arch-nemesis, Dr. Harrison Wells/Eobard Thawne, to teach him how to run faster. However, things don’t go as planned and Barry is stunned to face familiar foe Hartley Rathaway, as well as old friend Eddie Thawne. Iris makes peace with her past in order to embrace her future.
Director: Alice Troughton
Writer: Todd Helbing
After Zoom reveals his true plan, Barry vows to do whatever it takes to stop him.
Director: Antonio Negret
Writer: Todd Helbing
Pete Ross returns to town and finds a number of surprising changes since his departure. Besides resolving his feelings toward Clark since he learned of his friend's secret, Pete has to deal with the acquisition of a superpower of his own.
Director: Mike Rohl
Writer: Todd Helbing
After an unexpected guest from the future, Nora West-Allen, appears at their home, Barry and Iris must figure out how to get her back to the future without disrupting the timeline…even more than she already has. Team Flash must work together to send Nora back, while simultaneously fighting off another villainous meta.
Director: David McWhirter
Writer: Todd Helbing
Spartacus leads a daring assault to provide food and shelter for his people. Crassus builds a fearsome army and receives an unexpected visitor.
Director: Jesse Warn
Writer: Todd Helbing
Chrissy Beppo, with the authorization of the Department of Defense, has a message for the people of Smallville, not only is the merging of planets real, it is happening.
Director: Gregory Smith
Writer: Todd Helbing
Jay Garrick, a mysterious man from Earth-2, appears at S.T.A.R. Labs with a dire warning about an evil speedster named Zoom, who is set on destroying The Flash. Barry and the team must decide if they can trust this stranger even as they face yet another powerful meta-human. Meanwhile, Joe must deal with a determined officer named Patty Spivot who wants to join his meta-human task force.
Director: Jesse Warn
Writer: Todd Helbing
When Cisco gets a vibe of Eobard Thawne, Barry and the team don’t believe it. But, after an attack at Mercury Labs, Christina McGee confirms that the Reverse Flash is back. Meanwhile, Iris and Francine share a nice moment that brings Iris closer to her brother, Wally.
Director: Michael A. Allowitz
Writer: Todd Helbing
Having performed shamefully in the arena against Crixus, Spartacus is forced to fight in the Pits. Batiatus, determined to profit from Spartacus, may be at risk if his debts aren't repaid.
Director: Jesse Warn
Writer: Todd Helbing
Lois' undercover assignment reveals a deadly foe that promises to change the Kent family forever. Meanwhile, the Kent boys find themselves being pulled in opposite directions.
Director: Tom Cavanagh
Writer: Todd Helbing
After a bomb explodes downtown, the army rolls in and takes over. When Joe learns Iris is writing about 'The Streak' and tries unsuccessfully to have the story stopped, Barry decides to have The Flash pay her a visit.
Director: Dermott Downs
Writer: Todd Helbing
All of Smallville comes together to view a meteor shower, and Lex Luthor makes his move to take down Superman and Lois.
Director: Gregory Smith
Writer: Todd Helbing
Caitlin takes Barry out to a local karaoke bar to help them both find new loves. Caitlin strikes out but Barry meets a sports reporter and asks her out for a date. Meanwhile, Cisco considers Hartley's dangerous offer; and the team search for Shawna, a meta-human with teleportation powers who just busted her boyfriend out of Iron Heights.
Director: Rob Hardy
Writer: Todd Helbing
Grodd returns to Central City and kidnaps Caitlin. Barry and team race to find her before it’s too late. Meanwhile, Cisco plans his first date with the new barista at Jitters, Kendra Saunders and Patty begins to suspect Barry is hiding something from her.
Director: Dermott Downs
Writer: Todd Helbing