Toxic Morty

Toxic Morty is the secondary antagonist in the Rick & Morty episode "Rest and Ricklaxation". He was an embodiment of Morty Smith's negative personality traits.

He was voiced by the series creator Justin Roilland who also voiced Rick himself, Toxic Rick, Evil Rick and Evil Morty.

Personality
Toxic Morty was an overly neurotic, cowardly and weak creature who was Toxic Rick's sidekick and assisted him throughout the episode in his plans to take over the world and turn everyone toxic. He seems to be self loathing and fearful towards his grandfather who he allows to abuse and bully him.

History
Toxic Morty was created after Rick and Morty go into a detoxing machine at a spa which removes all of their toxic traits. He first appears on screen when Toxic Rick finds himself inside of the toxic world and tries to find Morty. He puts two and two together and realises that they were the toxic versions of the original Rick and Morty.

He and Toxic RIck then make a deal with C-137 Rick to merge again to which he agrees. He and Morty enter a chamber and end up in the normal world where it is revealed that they were planning on trapping Rick and Morty in the Toxic World (which was prevented by Morty's girlfriend due to a reluctant Morty not wanting to merge with his toxic self again). Towards the end of the episode he and Rick go on top of a beacon in order to begin the process, however he ends up being shot three times by the ordinary Rick in a torture method towards Toxic Rick until the latter agreed to merge again. Toxic Morty was kept by Rick within a syringe until he found the still detoxified Morty and injected it within him.