The Beatles

Liverpudlian pop band, The Beatles, had wanted to be on Doctor Who, and finally did appear in a brief spot of frequently-referenced-on-the-podcast serial, ‘The Chase’.
Podcast N181 The Devil’s Chord > > > >

A musical-ish episode with an actually sonic screwdriver, but no real twist at the end
Podcast C036 The Evil of The Daleks > > > > >

A Karl Marx lookalike delivers spiffing technobabble while time travel goes straight down the drain in this senseless yet hugely compelling serial.
Podcast C016 The Chase > > > > > > > > > > > > > > > >

The Doctor says farewell to two trusted companions, but first they battle Desert Squids, Frankenstein’s Monster, Dracula and Spherical Daleks.