There are many copies and stolen versions of this design out there on cheap tee websites. Don't be fooled. The original "Visit Tatooine" shirt will have an attribution to FloresArts and TeePublic.
Doctor Stephen Strange is a fictional character appearing in American comic books published by Marvel Comics. Created by artist Steve Ditko and writer Stan Lee, the character first appeared in Strange Tales #110 (cover-dated July 1963). Doctor Strange serves as the Sorcerer Supreme, the primary protector of Earth against magical and mystical threats. Inspired by stories of black magic and Chandu the Magician, Strange was created during the Silver Age of Comic Books to bring a different kind of character and themes of mysticism to Marvel Comics.
I had some fun making a parody :) *Update!* I've added another version of this in my store where the text is outlined in light grey for those wanting red or black shirts.