The Gospel is God's overcoming saved people entering life or God's overcoming saints preaching eternal life. The gospel in a nutshell,
"3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:" I Cor 15:3,4
The Gospel from Danny Bunn on Vimeo.