Season 4

01 Goodbye, Mr. Fish (1) Episode 115th September 1977 A neighborhood vigilante group runs amok, and Fish is AWOL on the day of his retirement. 02 Goodbye, Mr. Fish (2) Episode 222nd September 1977 Fish finally shows up for work, but refuses to acknowledge his mandatory retirement. 03 Bugs Episode 329th September 1977 Listening devices discovered in the squad room may have come from Internal Affairs - or the Nixon administration! 04 Corporation Episode 46th October 1977 A quixotic environmentalist faces the high-priced lawyer hired by the chemical plant he's been assaulting. 05 Burial Episode 520th October 1977 Retired Sergeant Fish returns to assist Barney in locating a pilfered corpse. 06 Copy Cat Episode 627th October 1977 Yemana scours the TV Guide to try to second-guess the felon who's aping the prime-time lineup crime shows; a drunk forgets the most important element in a hold-up - a weapon. 07 Blizzard Episode 73rd November 1977 A blizzard holes up the 12th with an unwelcome guest—a corpse; a self-proclaimed prophet is sure that the weather is indicative of a new ice age. 08 Chase Episode 817th November 1977 A taxi company is irate when Wojo totals a borrowed cab while pursuing a robbery suspect; Lieutenant Scanlon tries to ferret out 12th Precinct corruption with a drug pusher. 09 Thanksgiving Story Episode 924th November 1977 The detectives clean up after three mental patients sit down to Thanksgiving dinner at an automat. 10 Tunnel Episode 101st December 1977 Wojo is buried alive after a tunnel collapses on a burglar burrowing towards the diamond exchange; a homeless Harris is combing Manhattan for a new apartment. 11 Atomic Bomb Episode 1115th December 1977 Neither the bomb squad nor the government recognizes a college student's physics project as a functional atomic bomb - but Detective Dietrich does. 12 The Bank Episode 125th January 1978 A man charges a sperm bank with murder after the lab unwittingly destroys the man's last sample. 13 The Ghost Episode 1312th January 1978 The detectives are unimpressed with a man who claims he's being visited by a poltergeist - that is, until they lock the man up and strange events begin occurring about the squad room. 14 Appendicitis Episode 1419th January 1978 Yemana is hospitalized with appendicitis; the cage is a stopping-off place for a sugar addict and an aging bounty hunter. 15 Rape Episode 1526th January 1978 The city legalizes off-track gambling, to the delight of Yemana; a woman wants her husband arrested on a rape charge; a master of disguise perpetuates a crime spree. 16 Eviction (1) Episode 162nd February 1978 Barney puts his career on the line by refusing to forcibly evict the tenants of a condemned hotel, while Lugar tries to figure out what to do with his vacation time. 17 Eviction (2) Episode 179th February 1978 The hotel situation now involves a SWAT team, while Dietrich learns the identity of his amnesic ""girlfriend."" 18 Wojo's Problem Episode 1823rd February 1978 Wojo comes to Barney with a problem his superior would rather not know about; the 12th's new female detective has a very jealous husband, suspicious of her all-male co-workers; somehow a shoplifter escapes - in a wheelchair. 19 'Quo Vadis?' Episode 192nd March 1978 Barney uncovers, if you will, the real reason behind a woman's vehement insistence that a nude-painting exhibit at a local art gallery be shut down; the Millers may be heading for divorce. 20 Hostage Episode 2023rd March 1978 Harris finally finds an apartment in the Village; a ventriloquist insists he's not responsible for his dummy's insensitive remarks; a prisoner holds the boys at gunpoint. 21 Evaluation Episode 214th May 1978 The members of the squad nervously await Barney filling out their evaluation forms. Meanwhile, Harris arrests a numerologist who will only give his name as ""1223,"" and a porno shop reporting vandalism turns out to be a mom and pop operation being hassled by their kids. 22 The Sighting Episode 2211th May 1978 A man liquidates all of his assets into gold, much to his wife's dismay; Wojo claims he saw a UFO over Staten Island. 23 Inauguration Episode 2318th May 1978 Harris does some extensive soul searching when he's offered a job on the mayor's security team.