D&C 138

 As the righteous spirits waited in great excitement for the visit of the Great Redeemer being- 

"All these had departed the mortal life, firm in the hope of a glorious resurrection, through the grace of God the Father and his Only Begotten Son, Jesus Christ."  (Doctrine and Covenants 138:14)

Of many of these - 

"...he organized his forces and appointed messengers, clothed with power and authority, and commissioned them to go forth and carry the light of the gospel to them that were in darkness, even to all the spirits of men; and thus was the gospel preached to the dead.

31 And the chosen messengers went forth to declare the acceptable day of the Lord and proclaim liberty to the captives who were bound, even unto all who would repent of their sins and receive the gospel.

32 Thus was the gospel preached to those who had died in their sins, without a knowledge of the truth, or in transgression, having rejected the prophets."  (Doctrine and Covenants 138:30–32)

I specifically note "or in transgression" where  - 

"These were taught faith in God, repentance from sin, vicarious baptism for the remission of sins, the gift of the Holy Ghost by the laying on of hands,

34 And all other principles of the gospel that were necessary for them to know in order to qualify themselves that they might be judged according to men in the flesh, but live according to God in the spirit."  (Doctrine and Covenants 138:33–34)

With all the unfair "cards" that have dealt on earth, the Lord is still gracious to all repentance and works.