Which singer performed The Wonder Years' opening theme version?

Joe Cocker performed The Wonder Years’ opening-theme version of “With a Little Help from My Friends.”

The song was originally written by John Lennon and Paul McCartney and recorded by The Beatles for their 1967 album Sgt. Pepper’s Lonely Hearts Club Band. Cocker transformed it into a dramatic soul-rock performance, expanding the arrangement with gospel-influenced backing vocals, organ, guitar, and a much more forceful vocal delivery.

The Wonder Years used Cocker’s rendition as its opening theme during the show’s 1988–1993 run. The series followed Kevin Arnold as he remembered growing up in suburban America from 1968 through 1973, so the song also connected the program to the era’s music and social changes. The opening sequence changed over the seasons, but Cocker’s recording remained the defining musical signature.

The question asks who performed the version used by the show, not who wrote the song. That distinction explains why Lennon–McCartney is not the answer: they composed the original, while Joe Cocker supplied the famous cover.