Barry and team are surprised when Mon-El and Hank Henshaw arrive on their Earth carrying a comatose Supergirl who was whammied by the Music Meister. Unable to wake her up, they turn to Team Flash to save her. However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can't cure. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script, complete with singing and dancing, to the end. The crossover starts on Supergirl S02E16 Star-Crossed (I).
Ms. Snap changes the school lunch menu while Ms. Feldman starts an underground junk food ring; Hot Dad volunteers for lunch duty and Ms. Bennigan works up the nerve to ask him out on a real date.
Mary Jane joins forces with Justin, setting forth a plan that could oust Ronda from the anchor chair, but Kara gets caught in the crossfire.
Jess avoids her feelings for Nick by taking care of her dad in Portland. While attending a work party with Reagan, Nick panics that they really don't know each other. Meanwhile, Aly prepares to meet Winston's mom for the first time, as Winston admits he hasn't told her they are cops.
An unanticipated trip home puts Ezra at a crossroads about his future. Maddie and Patrick’s get-away is equal parts romance and deception. Jules comes face-to-face with her past.
Brennan testifies for Zach in trial, Angela reveals some big news, while Aubrey and Jessica come to terms about their future together. All the while, the team discovers Kovac has escaped, leaving Booth in a race against the clock to protect himself and those closest to him from what may be Kovac's most dangerous plan yet.
It's all hands on deck when Savannah struggles with a project for her clothing line. And after receiving an ultimatum from Todd, Chase will try anything to get his dog Lilo's behavior under control.
After a delay in the case a missing witness is found, revealing sloppy detective work. Kalief is faced with time served but refuses to plead guilty to a crime he didn't commit. He is released a month later without explanation.
Jane feels guilty that she isn’t around for Mateo as much as she would like, so she decides to run for Room Mom against none other than perfect mom, Petra. With the help of Jane and Xo, Alba tries to impress her crush. Rafael tries to be there for both Jane and Petra. Meanwhile, Rogelio tries to slyly get information from Mateo about Xo and Bruce’s relationship.
Trish returns to the scene of the crime in the hope it will prompt her to remember something more about the attack, while DC Katie Harford thinks she has a strong lead when she discovers a new suspect who doesn't have an alibi. Cath reveals interesting new information about the night of her party, while a match is made for the male DNA found on Trish. An unknown woman walks into the police station.
Riley's insistence to uncover the truth behind a fatal drug given to war vets results in her asset's child being taken. Bryan defies orders to rescue the girl and uncover the truth. When a break-in at Asha's apartment leaves her shaken, a new neighbor is there to calm her nerves.
While on a mission to repair a turbine at a wind farm, Team Scorpion must race to save Paige and Happy before the cable holding the gondola they are in snaps and sends them plummeting to the ground.
Ben learns some interesting facts about Tucker’s recent date, so he enlists Danny’s help in finding out the truth. As Bonnie and Brad are preparing to set off on their trip around the world, Brad is arrested by the FBI.
Gabi and Josh think their no-strings relationship means they can skip celebrating the day of love. But when they each are convinced the other bought a heartfelt gift, panic ensues. Confused about her situation with Josh, Gabi turns to her neighbor, the oft-married Ms. Wilson (special guest star Betty White), who reluctantly shares some advice. Meanwhile, Elliot and Alan have vastly different ideas about how to spend Valentine's Day, and Sofia and Yolanda team up for an anti-Valentine's Day celebration.
Jana and Imara run into familiar faces as they track Hartington. Selina competes in the taekwondo fight of her life and in doing so makes an unlikely ally. Jeffries laments the end of his career.
Katie and Tom's wedding is finally here and the whole group comes together to show their support. Jax and Tom give Schwartz the ultimate wedding surprise when they fly in his triplet brothers. Meanwhile, Stassi is moved to tears when she and Lisa finally bury the hatchet. Finally, Scheana insists her relationship with Shay is perfect, but Lisa suspects she may be hiding something
We meet three ride-or-die friends who live boldly liberal lives in one of the most conservative states in the nation. Jen and Lee try to get the old Angie "Pumps" back, but the current version isn't going anywhere. Meanwhile, Josh and Jen navigate the role reversal of their post-married life.
Norman attempts to piece together Mother's movements. In Seattle, Dylan and Emma confront an ugly truth. Sam's girlfriend, Marion, makes a spur-of-the-moment decision with far-reaching consequences.