Big Chill is the Omnitrix's DNA sample of a Necrofriggian from the planet Kylmyys.
He was voiced by Dee Bradley Baker who also voiced Diamondhead, Chromastone, Wildmutt, Swampfire, Humungousaur, Jetray, Echo Echo, Spidermonkey, NRG, Water Hazard, Terraspin, Armodrillo and Four Arms.
Big Chill is a humanoid, moth-like alien whose four wings and antenna can fold up into a hooded robe (much akin to a poncho), giving him the appearance of a phantom.
Big Chill has a blue body with black and white spots on his arms and legs that resemble ice chunks, a light blue torso, and large green eyes. He has three pointed fingers and a thumb on each hand, and two toes on each foot and a third toe-like extension on his ankles. Big Chill wears the Omnitrix/Ultimatrix symbol on his chest.
In Heroes United, he has a paler color scheme. The spots on his body are not symmetrical. He also has five fingers instead of four.
In Omniverse, Big Chill has a much more muscular build, also now having larger eyebrows and sharper ears. He has a belt on his waist where the Omnitrix symbol is located. He has bigger wings, claws, and a black beard design under his chin. 15 year old Big Chill in Omniverse looks exactly the same, but he lacks the belt and the Omnitrix symbol is on his chest.
Powers and Abilities
Big Chill is capable of breathing a freezing vapor that reduces the temperature surrounding the vapor, encasing targets in ice. He can generate ice beams from his hands that he can manipulate. In Vilgax Attacks, Big Chill was capable of generating spiked balls of ice around his fists, as well as hurling ice spikes. He could also cause these spikes to sprout from the ground that surrounds him. In Cosmic Destruction, it was revealed that he can attack with an, "icy uppercut," as well as manipulate the cold around him to make a frosty tornado.
Big Chill's body contains a density-altering protoplasm that allows intangibility.
Big Chill has enhanced strength. In Save the Last Dance, when Big Chill was on a metal-eating spree, he effortlessly ripped apart a large metal statue and snapped iron girders in half. This strength also extends to his jaws, as Big Chill was capable of chewing up metal statues, poles, buildings, signs, iron girders, serving trays, and drinking molten steel.
Big Chill is completely immune to extreme subzero temperatures. He is also able to resistant to extreme heats. It was revealed in Deep that Big Chill can survive underwater. Big Chill can also survive in the vacuum of space.
Ben 10: Alien Force
Big Chill first appeared in Kevin's Big Score, where he failed to stop Kevin from escaping in the Rust Bucket 2 and later defeated Vulkanus.
In Max Out, Big Chill battled some DNAliens.
In Plumbers' Helpers, Big Chill put out a fire and saved Gwen from falling to her death.
In Alone Together, Big Chill tried to cool down Reinrassig III and defeated a Dravek with his help.
In Good Copy, Bad Copy, Ben used Big Chill to follow Gwen and Kevin which led them to Albedo.
In Save the Last Dance, Big Chill was taken over by his reproduction instincts thrice. Whenever Ben attempted to turn into an alien other than Big Chill, the Omnitrix automatically and immediately turned him into Big Chill. Similarly, whenever the time called for it, Ben stopped doing whatever he is doing and transformed into Big Chill. He then started eating any metal object he could find and laid eggs and built a nest for them until the Omnitrix timed out, causing Ben to pass out, wake up in the middle of nowhere and forget everything he did. This kept happening until the eggs finally hatched, giving birth to 14 Necrofriggian babies.
In Voided, Big Chill defeated D'Void by freezing his drilling machine.
In Birds of a Feather, Big Chill froze a door to help Simian break it and encountered Lu. When Lu was thrown off the bridge by Simian, Big Chill switched into Jetray to save him.
In a flashback in Special Delivery, Big Chill defeated a DNAlien, but accidentally froze Mr. Baumann's car at the same time.
In Vengeance of Vilgax: Part 2, Big Chill was defeated by Vilgax, so he switched into Humungousaur.
In Inferno, Big Chill captured Mouldywarp.
In Fool's Gold, Big Chill battled primal Decka before switching into Echo Echo.
In Singlehanded, Big Chill, with no left hand, briefly fought some Vulpimancers in the Null Void before switching into Swampfire.
In Ben 10: Alien Swarm, Big Chill battled a swarm of Nanochips.
In Trade-Off, Big Chill defeated some Forever Knights.
In Above and Beyond, Big Chill fought Alan, but was soon forced to retreat when the rest of the Plumbers' Helpers came to help Alan.
In The Final Battle: Part 1, Big Chill defeated Kraab before switching into Jetray to destroy some asteroids.
Ben 10: Ultimate Alien
In Duped, Big Chill was used by Normal Ben to fight Urien, but was defeated.
In Hit 'Em Where They Live, Big Chill battled some Pickaxe Aliens before going Ultimate. Big Chill appeared again later when he was changing back to Ben.
In Video Games, Big Chill failed to defeat the Stalker, so he switched into Lodestar.
In Escape from Aggregor, Big Chill fought Galapagus before going Ultimate. Big Chill appeared again later when he was changing back to Ben.
In Too Hot to Handle, Big Chill battled P'andor before switching into Cannonbolt.
In Ultimate Aggregor, Big Chill went Ultimate to stop a group of fans from harassing him. Big Chill appeared again when he was changing back to Ben.
In Map of Infinity, Big Chill tried to negotiate with some Albino Necrofriggian guards, but ended up having to fight them when he mentioned that he and the team had to "grab" an artifact from the Mykdl'dy temple. Big Chill was then defeated by the guards, forcing him to switch into Echo Echo.
In Deep, Big Chill chased Ultimate Aggregor before going Ultimate. Big Chill appeared again later when he was changing to Goop.
In Absolute Power: Part 2, Big Chill battled Ultimate Kevin but failed to defeat him.
In Viktor: The Spoils, Big Chill snuck through a security grid, fought some Zarcovian soldiers and tried to keep Viktor frozen before going Ultimate. Big Chill appeared again later when he was changing back to Ben.
In It's Not Easy Being Gwen, Big Chill briefly battled Dr. Animo and his mutant frog.
In Prisoner Number 775 Is Missing, Big Chill searched through an alien prison in Area 51.
In Greetings from Techadon, Big Chill failed to get into the Techadon Factory. He then fought a silver Techadon robot before going Ultimate.
In The Flame Keepers' Circle, Big Chill battled the Flame Keepers before going Ultimate. Big Chill appeared again later when he was changing back to Ben.
In The Mother of All Vreedles, Big Chill fought Ma Vreedle but he got defeated by her.
In Ben 10-Generator Rex: Heroes United, Big Chill appeared thrice. Firstly, Big Chill escaped Providence HG and flew to what seemed like Bellwood, briefly freezing Rex along the way, before noticing that Mr. Smoothy was replaced with Bob's Biscuit Barn. Later, he caught a falling Rex during their fight against Alpha. Lastly, he flew Rex onto a skyscraper to look over Alpha-Omega's rampage.
In The Eggman Cometh, Big Chill defeated some mutated reptiles.
Ben 10: Omniverse
In Of Predators and Prey: Part 2, Big Chill defeated Khyber before escaping the latter's ship with Rook.
In Malefactor, Big Chill fought Hypnotick before reverting back to avoid her hypnotism.
In Showdown: Part 1, Big Chill escaped Terroranchula's web and defeated Zed, but was hypnotized by Hypnotick thrice.
In Ben Again, Big Chill was used by 11-year-old Ben in 16-year-old Ben's body to find coordinates.
In Tummy Trouble, Big Chill battled an Incursean in space. Later, Big Chill defeated another Incursean.
In The Frogs of War: Part 1, Big Chill froze Milleous.
In The Ultimate Heist, Ben used Big Chill twice to escape from Blukic and Driba until he proved that he is Ben disguised as Albedo.
In Something Zombozo This Way Comes, Big Chill froze some of the Zombie Clowns in place.
In Let's Do the Time War Again, Big Chill defeated Exo-Skull and Subdora.
In A New Dawn, Big Chill appeared for a short time when Ben was cycling through his aliens.
- When he equipped with the Ultimatrix, Big Chill can become Ultimate Big Chill.