“Caveman SpongeBob” was first featured in the Season 1 Episode 14a of SpongeBob SquarePants, which first aired in the United States on December 31st, 1999, under the title “SB-129”.
The episode depicts Squidward travelling through time, meeting the Grug versions of Patrick and SpongeBob.
The popular image macro seen on memes originates from this section of the episode.
The first meme usage of the character can be traced back to May 30th, 2009, when YouTube user NoCommercialValueNCV uploaded a video titled SpongeGar.
“Caveman SpongeBob” first appeared on an image macro meme on March 17th, 2015, posted on Twitter by @SpongeBobGetsIt.
By May 2016, the meme would appear in variations on Twitter, Reddit as well as 4chan and social media sites like Facebook and Instagram.
- Fandom – Encyclopedia SpongeBobia