In the aftermath of Superman's death , intelligence operative Amanda Waller
assembles a team of dangerous criminals — the deranged Harley Quinn ; elite hit
man Deadshot ; pyrokinetic ex-gangster El Diablo ; opportunistic thief Captain
Boomerang ; monstrous cannibal Killer Croc ; and specialized mercenary Slipknot — at
Belle Reve Penitentiary and places them under command of Colonel Rick Flag, to be
used as disposable assets in high-risk missions for the United States government.
Each member has a small bomb implanted in their head, designed to detonate should
any member rebel against Flag.

One of Waller's recruits is Flag's girlfriend, Dr. June Moone, an archaeologist who is
possessed by a spirit witch known as "Enchantress" after touching a cursed idol, and
who quickly spirals out of control, besieging Midway City with a horde of monsters
and nesting on a subway station, where she forces a commuter to become the host
for her brother, Incubus. Waller then deploys the squad to extract a high-profile
mark from Midway, and Flag alerts them that Enchantress' heart must be cut out of
her to regain control of her.

Ahead of their departure, they are joined by Katana , a warrior who wields a mystic
sword and acts as Flag's bodyguard. Harley's lover, the Joker, finds out about her
predicament and tortures one of Waller's men into leading him to the facility where
the nano bombs are made. The Joker has had the wife of one of the scientists
involved in the program kidnapped to blackmail him into disabling Harley's bomb.
Sensing the squad's approach, Enchantress destroys their helicopter, forcing them to
proceed on foot to their target. On the way, Boomerang convinces Slipknot that the
bombs are a ruse meant to keep them under control. Slipknot attempts to escape
and is killed, while the team is attacked by Enchantress' minions. The team manages
to escape to their final destination at an underground bunker, where they learn that
their mark is Waller herself, who is attempting to cover up her involvement.
The squad escorts Waller to the rooftop for extraction, but the arriving helicopter
has been hijacked by Joker and his men, who open fire on the squad and disable
Harley's bomb, allowing her to climb aboard. However, the helicopter is shot down
by Waller's men, and Harley jumps out while Joker seemingly perishes in the
explosion, after which Harley rejoins the squad. Alerted to Waller's whereabouts,
Enchantress' minions arrive and kidnap her.

With Waller compromised, the squad decides to abandon the mission, while Flag
chooses to continue. Realizing they have an opportunity to prove themselves, they
soon join him and locate Enchantress and Waller at the partially flooded subway
station. Killer Croc goes underwater to plant a bomb underneath Incubus while the
others fight the Enchantress and her forces. El Diablo embraces his abilities and
manages to hold Incubus down as the bomb goes off underneath, killing them both.
Enchantress offers to fulfill the squad members' deepest desires in exchange for
their allegiance, and Harley feigns interest in order to get close enough to cut out
Enchantress' heart. Just after, Flag throws a bunch of explosives into the portal as
Deadshot shoots it, closing the portal. Flag takes Enchantress' heart and crushes it,
killing Enchantress and freeing June. The squad members are then returned to Belle
Reve, but with 10 years alleviated from their sentences and special privileges.
Shortly afterwards, the Joker, who survived the explosion, arrives with his men to
rescue Harley.

In a mid-credits scene , Waller meets with Bruce Wayne, who agrees to protect her
from the backlash of Enchantress' rampage in exchange for access to the
government's files on the expanding meta-human community. Waller alludes to
Wayne's secret identity as Batman, while he assures her that the Suicide Squad is
unnecessary and that his new friends will handle things from then on.

#Copied from Wikipedia https://en.m.wikipedia.org/wiki/Suicide_Squad_(film)