Personal Info:
Real Name: Lars Hanscom
Also Known As: Doctor Lars Hanscom
Place Of Birth: 30th Century
First Appearance: Adventure Comics Vol.1 #336 (1965) Silver Age Villain
Known Associates: No known Associates
Group Affiliation: None
Base Of Operations: 30th Century
Grudges: Legion of Super-Heroes
Creators: Edmond Hamilton and John Forte
Starfinger’s: Starfinger's right hand has five star tipped fingers, each of which can project different energy rays. Each ray has a different property including: a neutralizing ray, super-lightning, a super-thrust ray, super-radiation (e.g. heat, Green Kryptonite, gamma rays, shrinking rays, etc.) and a freezing ray. Using all the fingers together projects a distorting ray that scambles superpowers and makes them function erratically.
A noted physician and cyberneticist, Doctor Lars Hanscom was horrified by the thought of aging and losing his faculties, creating for himself an alter ego called Starfinger who had no weaknesses or frailties. He even went so far as to found a criminal gang to serve under Starfinger. When the Legionnaire Lightning Lad came under his care in the latter half of the 30th Century, he hypnotised the young hero into becoming the costumed criminal Starfinger. Using the power at Lightning Lad's disposal, Hanscom attempted to obtain rejuvium, a rare element that would restore his youth. He was foiled by the remaining Legion of Super-Heroes.
Hanscom wasn't finished yet though; he adopted the persona of Starfinger himself, and on at least one occasion used complex technology to simulate the powers Lightning Lad had demonstrated in the Starfinger costume. Starfinger is by all accounts something of a coward, generally seeking to strike at the Legion through intermediaries. Lars Hansom would be the first of three individuals to take the title Starfinger.
Starfinger I at DC Database
Starfinger I at Comic Vine