Splinter receives a vision of his Master Yoshi...and a mission. He must stop the Shredder. Time is running out. He doesn't know how to explain it to his sons, but they need no explanation. They're with their father to the bitter end.
After the Warriors befriend a mermaid trapped in ice that's being hunted by an ancient warrior, they soon discover that the warrior and mermaid aren't exactly what each appears to be.
Hot Shot and the Autobots battle Ransack and Crumplezone in the first round, while Starscream continues to build his forces when he recruits Mudflap and Lori and Bud uncover information on the Ancients' prehistoric visit to Earth.
The gang investigate the International Sand Building Competition where a strange coral monster has appeared from the Great Barrier Reef to scare the contestants.
Rose is taken home, but a spaceship crashes in the Thames and London is closed off... Enter the Slitheen!
The city is in a panic as a sniper goes on a shooting spree and randomly kills several people, including a postal worker. The investigation reveals that more than one shooter is at work. As Charlie works the case, he's frustrated by a sniper expert Don brings in to help out.
Joan and Grace fear the worst when, on the heels of failed attempts to reconnect with Joan, the emotionally fragile Adam goes missing during a hike... Despite Grace's attempts to foster a more comfortable rapport between her friends, Joan is intent on hurting Adam with her rebuffs, which she regrets when it appears that his life may be in danger. Meanwhile, Helen is shocked when a priest tells her that the man who raped her 25 years ago would like her to visit his deathbed so he may apologize. Also, Luke is dismayed and intrigued when he learns that Friedman has been getting stoned.
To contact the spirit of the previous Avatar, Aang must reach a temple in the Fire Nation before the sun sets on the following day. There he will learn what he must do to restore balance to the world. Zuko must defy his banishment to follow Aang.
As Trance's sun closes on Seefra-9, Rommie is rebuilt by Doyle to help evacuate the planet.
After C.J. discovers that Cate may be starting a relationship with Principal Gibb, he blabs it to Bridget. An angry Cate has Gibb put C.J. in charge of the student detention on Ditch Day, and C.J. gets even by detaining Bridget. Because she is stuck in detention and can't complete the Ditch Day prank herself, Bridget convinces Kerry and Rory to steal the rival school's mascot.
When Billy finally gets a "secret decoder ring" in his Blasto Bits cereal, he receives a holographic message from a strange creature who speaks about finding the "Secret of the Universe" in an abandoned mine shaft. All the other children of Endsville, also with decoder rings, race to the mine to be the first one to get the Secret. The entire effort is revealed to be a trap laid by Lubbermouth, a worm-like creature from Grim's past, who wishes to free herself from the curse of guarding the Secret. When Mindy looks down at the pit, she becomes the new guardian of the Secret and has to stay there forever.
After a trip to the mall, Mandy becomes the spokesperson for Happy Huggy Stuffy Bears, a new stuffed toy in town. After the success of her commercial, Mandy gives away stuffed bears to other children, who start wreaking havoc in the city. Eris, the goddess of chaos, is behind the toys, which mind-control the children into creating chaos. Mandy decides not to share control of the world with Eris, and orders Grim to destroy the toys.
Carey gets a secret admirer. Zack and Cody end up hooking her up with the wrong guy. Now they have to find the right guy that is Carey's secret admirer. Mr. Moseby and London get ready for Mr. Tipton's arrival.
Chester Yapsby has stolen a top-secret project that is capable of making insects grow to incredible heights. Kim is contacted for the assignment because she never fails to get a job done, though when it turns out that the giant cockroaches bother Kim as she has a personal fear of insects. Ron must help her overcome her fear in order to save the day. Meanwhile, Ron names one of the cockroaches Roachie and decides to keep it as a pet, much to Kim’s chagrin.
When Mrs. Hatchet discovers that Kim has an overdue library book, KP's cheerleading activities are suspended. Ron realizes that he lost the book, and he has to retrace his steps through the last few missions he and Kim went on to save Kim from...library lock-up!
Krypto is missing and it's up to Streaky the Cat to rescue him.
Faith investigates Bosco further, Sasha and Ty make up, Cruz goes for some spiritual healing, Carlos meets Holly's parents.
It's soccer season and as per usual, Phil has soccer-on-the-brain. But when Lil casually joins the team, she surprises everyone, including herself, by instantly becoming a super star. At first Phil is excited about having another soccer-head in the family, but when Lil outshines him, he starts to resent her. When Lil finally realizes how upset Phil is, she has to decide whether to walk away from something she loves or continue to play and risk pushing away her only brother.
Kibre prosecutes an elusive career criminal for the murder of a sleazy ex-cop and the shooting of a detective. As Kibre's office works with Detective Fontana, they discover their prime suspect might also be a producer of snuff pornography. When a sting goes bad and a shocking courtroom development cuts the legs from under her case, Kibre's career teeters on finding why the shootings were committed in the first place. This crossover starts on Law & Order S15E20 Tombstone (I).