If a "Who's on First" bit was extended into a entire criminal career, Mr. Who is a scientist who discovered a life-changing serum that helped him to change into any form needed, create giant spiders, and have super-strength...and instead of selling it used it to rob art galleries. Mr. Who first appeared More Fun Comics #73 -- Bring your toys to life with Toy Spray! Now with 40% fewer existential crises! Check it out at https://toy.spray/best