“Dynamite” appears to be based on the life of Cuban singer Ady León, who plays the lead role. She portrays a young orphan living under the guardianship of her abusive and humiliating aunt. Ady escapes and leads a troubled life, drinking, using drugs, and having affairs. Leaving a bar, she is nearly raped, but Cairo, a Black man, intervenes, supporting her and encouraging her to turn her life around. He pushes her to become a boxer. She accepts and begins training with a friend of Cairo's known as El Italiano.