Short Circuit 2 is a 1988 American science fiction comedy film, the sequel to the 1986 film Short Circuit. It was directed by Kenneth Johnson and starred Fisher Stevens as Ben Jahveri, Michael McKean as Fred Ritter, Cynthia Gibb as Sandy Banatoni, and Tim Blaney as the voice of Johnny 5 (the main character – a friendly, naive, self-aware robot).

After being fired from Nova Robotics after the events of the first movie, Benjamin Jahveri (nee Jabituya) starts up his own business, "Titanic Toy Corporation", which specializes in making sophisticated toy robots that he builds by hand from the back of his truck. For two days, Ben has been in an unspecified U.S. metropolis peddling his toy robots on the street corners. One robot wanders away from his stand and ends up in the office of Sandy Banatoni, an assistant buyer for Simpsons' toy department. Sandy tracks Ben down and orders 1,000 of his toys. Overhearing this offer is con artist Fred Ritter, who smooth-talks his way into brokering the transaction between Ben and Sandy, becoming Ben's business partner in the deal, and later acquires the funding Ben needs from a loan shark.

Ben and Fred, with some new workers, move into a derelict warehouse which, unknown to them, is the base of operations for thieves who are tunneling into a bank vault across the street to steal a set of jewels known as the Vanderveer Collection. The thieves (Saunders and Jones) assault Ben and Fred and destroy their equipment, causing the new workers to flee and preventing them from completing Sandy's order. However, Ben's friends Stephanie Speck and Newton Crosby have sent Johnny 5, a robot who became sentient after being struck by lightning whom Ben helped to create. When Saunders and Jones return, Johnny fends them off, then sets up self-defense mechanisms should they try to break in again. Johnny sets to work mass-producing the toys to meet Sandy's deadline but later leaves to explore the city. He runs afoul of many people, who are rude and unfriendly to him. He befriends one man, Oscar Baldwin, who works at the bank across the street from Ben and Fred's warehouse.

Fred, having learned that Johnny is worth $11 million, tries to sell him. Discovering this, Johnny escapes into the city, is taken into police custody, and is placed in the stolen goods warehouse, where he is claimed by Ben. Johnny uses his robotic abilities to help Ben court Sandy.

With time running out before the Vanderveer Collection is moved from the bank and in the lieu to keep Ben and Fred from interfering, Saunders and Jones lock the duo in the freezer of a Chinese restaurant. It is revealed that Oscar is the mastermind of the heist, and he tricks Johnny into finishing the tunnel leading to the vault. Ben and Fred get Sandy to save them, using polyphonic renditions of songs that Ben learned on his date with her as clues to their location. Having discovered the Vanderveer Collection, Johnny deduces Oscar's true intentions and is severely damaged by Saunders and Jones per Oscar’s orders. As Ben, Fred and Sandy return to the warehouse, the police arrest Ben and Sandy as suspects in the bank vault break-in. Fred eludes capture and later finds the disheveled Johnny in an alley and informs him of Ben's arrest.

Fred attempts to repair Johnny by breaking into a Radio Shack and following Johnny's guidance, but with limited success. Ben and Sandy are cleared of any charges for the break-in and persuade the police to help locate Johnny. An enraged Johnny vows revenge for Oscar’s betrayal, and with Fred’s help, tracks down Oscar and his accomplices. Saunders and Jones are caught by Fred and Johnny and later arrested. However, Oscar attacks Fred and attempts to flee on a boat. Johnny gives chase and, as his backup battery dwindles, uses a crane to swing Tarzan-style to capture Oscar, who is then apprehended by police. Ben, Fred, and Sandy arrive and tend to an exhausted Johnny while the last of his power supply depletes. Ben revives Johnny with a defibrillator.

Johnny is fully repaired and becomes a celebrity, while Ben, Fred, and Sandy start a new company called "Input Inc." with Johnny as its mascot. Johnny and Ben later take the Oath of Allegiance to become United States citizens. After the ceremony, when questioned by reporters about his thoughts on becoming the country's first robotic citizen, a gold-plated Johnny leaps into the air and exclaims "I feel alive!"

• Tim Blaney as the voice of Johnny 5, the self-aware robot
• Fisher Stevens as Benjamin Jabituya Jahveri, the peddler, later toy robot builder
• Michael McKean as Frederick "Fred" Ritter, the con artist
• Cynthia Gibb as Sandy Banatoni, Assistant Buyer, Simpson's Toy Department
• Jack Weston as Oscar Baldwin, the First Federal Trust Bank Worker, later Mastermind Heist
• David Hemblen as Jones, the young bank robber
• Dee McCafferty as Saunders, the older bank robber
• Don Lake as Manic Mike, the Radio Shack owner
• Ally Sheedy as Stephanie Speck (voice only, uncredited)
• Gerry Parkes as the Priest with no name given

Short Circuit 2 had initially been developed with original film's director John Badham, but Badham dropped out in order to do Stakeout^[3] Principal photography of the film took place between September 13 and December 1987 in Toronto, Ontario, Canada.^[1] Despite the film taking place in an American metropolis, much of the shots throughout the film featured prominent downtown Toronto landmarks.^[4][5] Five robots were used for filming the "Johnny 5" character. Reported complications arose with their hydraulic and electrical systems due to rainy and cold weather during production.^[1] The film's budget was reportedly $15 million.^[1]

The movie was originally titled Short Circuit 2: More Input, as seen on much of the promotional material.^[6]

Short Circuit 2 was released on August 7, 2001, and re-released on DVD on April 24, 2007,^[15] which included a "making-of featurette" on actor Fisher Stevens. In 2010, the film was released once again with alternative cover art. A Blu-ray disc of the film was released in April 2011, though no extras were included.

In 2021, a Blu-ray release of the movie was released in the United Kingdom, with several extras including commentary by Kenneth Johnson. ^{[citation needed]}

Hot Cars, Cold Facts, made in 1990, is a short educational film featuring the character Johnny 5, voiced by Russell Turner. It also starred Gina Revarra as Lisa, John Hugh as Officer Dave, and Donald Bishop as Howard. The film takes place after Short Circuit 2.