From difunctionalization of a single alkene to radical-dual-difunctionalization of two different alkenes! Abundant aliphatic aldehydes were readily decarbonylated into alkyl radicals for the cascade construction of C(sp³)–C(sp³), C(sp³)–C(sp³) and C(sp³)–O bonds via double radical addition and radical–radical coupling, following the intrinsic nucleophilic/electrophilic reactivity of both the radicals and alkenes.