I'd hardly call Space Rangers the "greatest" anything. It had its moments, but it was pretty mediocre all around.
I was rather fond of the original, 1992 TV series version of Human Target -- which, unlike the recent Mark Valley series, actually had something to do with the comic it was based on besides the title and the main character's name. (The premise was that Christopher Chance disguised himself as people whose lives were threatened, making himself the target. The Valley version just made him a bodyguard for hire, a much duller idea.) It was from Danny Bilson & Paul DeMeo, who had previously produced the live-action The Flash and written The Rocketeer, and it had pretty innovative visual effects, lots of clever split-screen variations to show the disguised main character interacting with the people he was disguised as. It also delved a lot into the psychology that would drive the lead character to constantly risk his life, and explored the consequences of constantly subsuming his identity. It was a neat show, but it didn't catch on and only ran for seven episodes.