The endohedral cluster anion [Pd3Sn8Bi6](4-) crystallizes as its K([2.2.2]crypt)(+) salt 1 upon reaction of [K([2.2.2]crypt)](2)[Sn2Bi2]center dot en and Pd(dppe)(2) in 1,2-diaminoethane (en)/toluene and incorporates a complete Pd-3 triangular cluster within a medium-size 14-vertex cage of Sn and Bi atoms. 1 was characterized by a combination of single crystal diffraction, ESI mass spectrometry, elemental analysis, and magnetic measurements. According to quantum chemical investigations, the Pd-3 triangle interacts only wealdy with the Sn/Bi cluster shell despite the relatively small cavity inside the cage.