Darkstar is the name of three characters appearing in American comic books published by Marvel Comics. Created by Jenny Blake Isabella and George Tuska, the Laynia Petrovna Krylova version of Darkstar first appeared in The Champions #7 (August 1976).

Darkstar is a Russian mutant, a subspecies of humans born with superhuman abilities. Darkstar can manipulate the Darkforce, an extradimensional energy form. She has been depicted as a member of various super-teams in her career, including X-Corporation and Champions of Los Angeles.

Darkstar (Laynia Petrovna) first appeared in The Champions #7 (Aug. 1976), and was created by Jenny Blake Isabella and George Tuska.

She became a regular character in Champions for the remainder of the series' brief run, though she never joined the titular supergroup. A memo from series writer Bill Mantlo revealed that he intended for her to be a "floating" member who would come and go from the book as the occasion called for.

Sasha Roerich first appeared in Hulk (Vol. 2) #1 (January, 2008), making nine appearances before dying in Hulk: Winter Guard #1 (December, 2009). Sasha was overtaken by Reena Stanicoff, debuting in the issue of her death. She appeared in five issues before dying in Darkstar and the Winter Guard #3 (August, 2010).

Laynia Petrovna and her twin brother Nikolai Krylenko are born in Minsk. After growing up, she becomes a special operative, working for the Soviet government.

Darkstar is a member of a Soviet super-team recruited to bring Black Widow back to the USSR. However, she decides to switch sides and then fights alongside the Champions. She helps the Champions on a few more missions before returning to Russia.

Darkstar becomes a member of the Soviet Super-Soldiers with her brother Vanguard (Nikolai Krylenko) and the Crimson Dynamo (Dmitri Bukharin). The Soviet Super-Soldiers battle Iron Man and Jack of Hearts on the Moon but wind up helping them against renegade Rigellians led by Commander Arcturus.