Season 6

In September 2011, Adult Swim renewed Robot Chicken for a sixth season. Season 6 started on April 1, 2012 at 11:30PM with "The Green Knight" and ended on June 9, 2013 at 12AM with the episode, "Immortal". 56 episodes were aired, the most out of all the seasons.
On August 5, 2012, with the airing of "Mauled By a Lion", the show joined Stoopid Buddy Stoodios. 
The first 11 episodes of season 6 are continuations from season 5, mashups of the writers' favorite movies.
The rest of the episodes, the ones made by Stoopid Buddy Stoodios, are named after causes of death. 
The last 16 episodes of season 6 are death puns.
The season
The Green Knight April 1, 2012
Drag Me to Wonderland 
April 8, 2012
The Italian Cable Guy April 15, 2012
Constantidious 
April 22, 2012
Tornado Coming 
April 29, 2012
The Mechanic  
May 6, 2012
The Rite 
May 13, 2012
Naru-210 
May 20, 2012
Slip Pants 
May 27, 2012
A Clockwork Red 
June 3, 2012
Where is He? 
June 10, 2012
Robot Chicken DC Comics Special July 1, 2012
Mauled By A Lion August 5, 2012
Decapitation
August 12, 2012
Tied to a Six-Car Monorail on a Railroad Track August 19, 2012
Hit in the Face 3000 Times By a Baseball Bat August 26, 2012
Mentally Unstable While Doing Coke
September 2, 2012
Drunk From Too Much Twine
September 9, 2012
Executed By the State September 16, 2012
Crushed By A Steamroller on My 53rd Birthday
September 23, 2012
Punctured Jugular
September 30, 2012
Poisoned By Relatives
October 7, 2012
Hurtled From A Helicopter into a Speeding Train
October 14, 2012
Disemboweled by an Orphan
October 21, 2012
In Bed Surrounded By Loved Ones
October 28, 2012
Choked on Multi-Colored Scarves
November 4, 2012
Hemlock, Gin and Juice
November 11, 2012
Collateral Damage in Gang Turf War
November 18, 2012
Eaten By The Stoop!d Monkey November 25, 2012
Eviscerated Post-Coital By a Six Foot Mantis
December 2, 2012
Butchered in Burbank
December 9, 2012
Robot Chicken's ATM Christnas Special
December 16, 2012
Verminated
December 23, 2012
French Fried
December 30, 2012
Mercury In Uranus December 30, 2012
Papercut to Aorta
January 6, 2013
Caffeine-Induced Aneurysm
January 13, 2013
Eaten By Cats
January 20, 2013
Botched Jewel Heist
January 27, 2013
Robot Fight Accident
February 3, 2013
Choked on a Bottle Cap
February 10, 2013
Bomb Bino
February 17, 2013
Die-Agra
February 24, 2013
Succu Offed
March 10, 2013
Coming & Going
March 17, 2013
Coffin Nailed
March 24, 2013
Greased is the Word
April 1, 2013 (aired April Fool's Day at Midnight, right before a rerun of Robot Chicken episode "Disemboweled by an Orphan")
Blades of Gory
April 7, 2013
Boris Bititoff
April 14, 2013
Rub A Dubbed Out
April 21, 2013
Cock A Doodle Die
April 28, 2013
Chucked Up
May 5, 2013
Little Person, Big Death
May 12, 2013
ReToaded
May 19, 2013
Vegged Out
May 26, 2013
Belly'd Up
June 2, 2013
Immortal
June 9, 2013
Alterate episodes:
Gang Raped (Airing February 3, 2014)
The Chicken is Back (Airing February 4, 2014)