| Summary: | <p>We report the synthesis of two new cluster anions, [Cu<sub>4</sub>@E<sub>18</sub>]<sup>4–</sup> (E = Sn, Pb), in which a Cu<sub>4</sub> subunit is incorporated into a continuous E<sub>18</sub> tetrel cage. Both anions are characterized by X-ray crystallography and mass spectrometry, complemented by quantum-chemical calculations that highlight the relationships to known Zintl clusters, including the stannaspherenes and plumbaspherenes [M@Sn<sub>12</sub>]<sup><em>q</em>−</sup> and [M@Pb<sub>12</sub>]<sup><em>q</em>−</sup>, the Matryoshka bronze [Sn@Cu<sub>12</sub>@Sn<sub>20</sub>]<sup>12–</sup>, and also [Pd<sub>2</sub>@E′<sub>18</sub>]<sup>4–</sup> (E′ = Ge, Sn).</p>
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