Origin
Mr. Sick is a Meeseeks used by Rick Sanchez to distribute illegal drugs across the galaxy. As soon as a Meeseeks achieves his goal (i.e. giving the drugs to the buyer) it disappears. Mr. Sick was a Meeseeks who got caught by the law before he could give the drugs to the buyer. Thus he was forced to live a long (and for Meeseeks a painful) live in prison, until he broke out with the help of Peacock Jones.