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We develop exceptional field theory for E$_{8(8)}$, defined on a(3+248)-dimensional generalized spacetime with extended coordinates in theadjoint representation of E$_{8(8)}$. The fields transform under E$_{8(8)}$generalized diffeomorphisms and are subject to covariant section constraints.The bosonic fields include an `internal' dreibein and an E$_{8(8)}$-valued`zweihundertachtundvierzigbein' (248-bein). Crucially, the theory also featuresgauge vectors for the E$_{8(8)}$ E-bracket governing the generalizeddiffeomorphism algebra and covariantly constrained gauge vectors for a separatebut constrained E$_{8(8)}$ gauge symmetry. The complete bosonic theory, with anovel Chern-Simons term for the gauge vectors, is uniquely determined by gaugeinvariance under internal and external generalized diffeomorphisms. The theoryconsistently comprises components of the dual graviton encoded in the 248-bein.Upon picking particular solutions of the constraints the theory reduces to D=11or type IIB supergravity, for which the dual graviton becomes pure gauge. Thisresolves the dual graviton problem, as we discuss in detail.

Exceptional Field Theory III: E$_{8(8)}$