Star Trek: Voyager - Season 5 Episode 16 -

Janeway is confused but won't give up on her crew mate and friend. Two years after being liberated from the collective, Seven of Nine rejoins the Borg, seemingly of her own will. When Janeway finds a history of transmissions from the Borg to Seven, she is convinced that Seven was lured back against her wishes. Meanwhile, aboard the Borg sphere, the Borg Queen attempts to seduce Seven into helping her assimilate Earth.