Senyaka was a mutant recruited by the mutant Fabian Cortez as a member of a second group of the Acolytes. On their first mission, this new team of Acolytes attacked the Our Mother of The Sacred Heart school whilst searching for a mutant child. During the assault, Senyaka displeased his lord Magneto after critically injuring a human nurse with his energy coils and was apparently slain by Magneto who crushed Senyaka with his own coils.
Senyaka survived, however, by siphoning the life energy from agents of the international law enforcement agency known as S.H.I.E.L.D. who had recovered Senyaka's body. Seeking revenge on Magneto, Senyaka set out to kill sea captain Lee Forrester, a former paramour of the self-styled master of magnetism. Forrester teamed up with the mutant soldier from the future named Cable, and Senyaka was seemingly killed once more in the ensuing battle.
Senyaka later reappeared as a member of a faction of Acolytes led by Exodus who participated in an assault on Wundagore Mountain in the European country of Transia, home of the enigmatic scientist known as the High Evolutionary. The Evolutionary had developed a powerful mutagenic compound known as Isotope-E, which the Acolytes coveted.
After Exodus was defeated, Senyaka found himself amongst the ranks of former Acolytes who aided the Carrion Cove rebellion against Magneto's rule of the island nation of Genosha. Senyaka survived the genocide of the Genoshan population at the hands of giant mutant-hunting robot Wild Sentinels controlled by Cassandra Nova, the genetic twin of Professor Charles Xavier, and joined Exodus and his fellow Acolytes when they allied themselves with Mister Sinister and his Marauders. Senyaka was tasked with assassinating Cable and destroying Providence. Even though Cable survived the assassination attempt, Providence was destroyed and Senyaka seemingly perished in process.
However, Senyaka later resurfaced as one of Selene's Death Dealers.
During the Necrosha event, Senyaka assaulted Necropolis with the rest of Selene's followers, and is responsible for the death of Meld.
X-Men: The Animated Series
Senyaka made a cameo appearance in the X-Men Animated Series episode "Secrets, Not Long Buried". Senyaka is one of the many residents of the mutant-dominated community of Skull Mesa.
Wolverine and the X-Men
Senyaka first appears in the Wolverine and the X-Men episode "Greetings from Genosha." He is one of the many Acolytes of Magneto. In "Battle Lines," Senyaka and Pyro attack MRD Facility Beta in the Northwest to break out the mutants imprisoned there. He later battles Gambit in "Aces & Eights".