The Rover version of "Invisible Dick" was a text serial originally appearing in 1922; the character was revived for a Dandy strip that ran from 1937 to 1939, drawn by George Ramsbottom. In both, Dick turned invisible using liquid from a mysterious Egyptian bottle given to him by a peg-legged sailor.
The Sparky version of the strip ran from 1968 to 1977. Dick's origin was tweaked for this revival: now, he got his powers from a torch taken from a space capsule by Dick's astronaut father; somehow, being in space had given the torch strange properties.
In 2014 the strip was revived for the digital magazine Comic Review. Written by Gary Chudleigh and drawn by Graeme Kennedy, this version is titled simply "Invisible".