Singin' with the Brains - "Planet of the Ood" & "Time and the Rani"
No Not the Mind Probe: A Doctor Who podcast - A podcast by Porter Mason & John Grant
The Doctor and his big brain comes face to face with an even bigger brain. Like, for real, just, like, I mean, these episodes both have just huge pulsating brains in them. (And also it's Sylvester McCoy's first appearance.)