The second season of the animated television series Rick and Morty originally aired on Cartoon Network's late night programming block Adult Swim in the United States on July 26, 2015, with "A Rickle in Time", and concluded on October 4 with "The Wedding Squanchers".

Other cast members of the season, who each have voiced one or more characters, include: Jay Johnson, Tom Kenny, Jill Talley, Paul F. Tompkins, Scott Chernoff, Ryan Elder, Will Jennings, Maurice LaMarche, Tress MacNeille, Ryan Ridley, John Kassir, Dawnn Lewis, Nolan North, Rob Paulsen, Gary Anthony Williams, Tony Barbieri, Kevin Michael Richardson, Jevin Smith, Tara Strong, Dan Benson, Dan Harmon, Jess Harnell, Phil Hendrie, William Holmes, Cassie Steele, Mike McCaffery, Brandon Johnson, James Atkinson, Rob Schrab and Arin Hanson.

Continuing from "Ricksy Business", Rick, Morty and Summer spend six months repairing the house and screwing around with time frozen.

A creature in charge of safeguarding time appears and gives them collars that integrate all the timelines, then attempts to arrest them because Rick stole the time-freezing crystal.

Rick, Morty, and Summer show uncertainty on purpose and break the collars, splitting into sixty-four timelines, and they simultaneously beat up the same creature.

Rick plans to spend the day at the "Blips & Chitz" video arcade, but Morty decides to stop the assassin.

Summer finds the assimilation unethical, until she and Morty witness some inhabitants regain their identities and start a race war.

Eventually, Morty discovers that the parasites can only create positive memories, allowing the Smith family to confirm one another's existence and kill all the aliens.

A massive alien head (a "Cromulon") appears over Earth, demanding to hear an original song, so Rick and Morty improvise "Get Schwifty".

Morty steals Rick's portal gun and leaves him alone with Ice-T—the only musician to survive an earthquake that struck the Grammy Awards—to make a hit original song and save earth.

Rick, Morty and Zeep are left stranded in a third miniature universe, as the pilot commits suicide and destroys his ship.

Much to the disdain of her classmates, Summer deliberately gets him expelled by denouncing him as the killer of the vampire Coach Feratu (a reference to Nosferatu).

Jerry is treated in an alien hospital after unknowingly ingesting some bacteria stored by Rick in a pint of Cherry Garcia.

While his family is in the waiting room, watching an assortment of TV channels from alternate realities, Jerry is asked by doctors to donate his penis, to be converted into a replacement heart to save the life of civil rights activist Shrimply Pibbles.

Rick and Morty visit another planet to purchase wiper fluid and witness "The Festival", an annual event where the local populace commits crimes for one night without consequence.

Morty then goes on a seemingly uncharacteristic killing spree before Rick knocks him out, and he and Arthricia—who desired to stop the Festival—storm the castle of the corrupt nobility who introduced it, slaughtering them.

The planet's remaining inhabitants decide to create a new society; however, rioting breaks out over disputes, and one suggests keeping the Festival after all.

Morty feels guilt over his rampage, but Rick (falsely) blames it on the effects of a candy bar he ate, and asserts that his character remains unchanged.

[21] Wes Archer, Dominic Polcino, Bryan Newton and Juan Meza-León served as directors, while series co-creators Justin Roiland and Dan Harmon, Matt Roller, David Phillips, Ryan Ridley, Mike McMahan, Tom Kauffman, Dan Guterman and Alex Rubens served as writers.

The site's critics consensus reads: "Rick and Morty gains even more slimy layers of complexity throughout its sophomore season, with the dysfunctional duo knocking heads and diametrically opposed philosophies during a string of intricately hilarious misadventures.