Mr. Stain, also known as Ga-Ra-Ku-Ta: Mr. Stain on Junk Alley, is a digital computer anime series created and directed by Ryuji Masuda. The producer of the show is Shunsuke Koga and the characters are designed by Wakako Masuda. The series involves surreal adventures centered on characters living in a junk-filled alley.The episodes are short, with a duration of about seven minutes, and start with Mr. Stain finding an object. The name of the episodes are the same as the items that Stain finds. There is no dialogue, just music and sound effects. Each episode's ending credits show the characters who appeared along with their names in English, followed by a segment of everyone dancing and having fun.

The CGI was produced by FUNimation Entertainment and premiered between 10:50 p.m. and 11:30 p.m. on December 31, 2002. It was broadcast in Japan by Kids Station, beginning January 6, 2003, on Monday, Tuesday and Wednesday at 12 p.m.. It was also aired in Brazil by Cartoon Network. FUNimation also included episodes of Mr. Stain on many of its other DVD releases. These short comedy bits were well received by DVD viewers and interest in the series grew. A DVD release of the show was also launched by FUNimation for the USA and Canada region.