That rather fetching cover was designed by Mister Clayton Hickman of DWM.
Special features for the disk include:
Commentary by Tom Baker, Elisabeth Sladen, producer Barry Letts and writer Terrance Dicks
Are Friends Electric? (dur. 38' 58") - A documentary, which looks at Tom Baker's introduction as the Doctor and the making of his first story. It features interviews with actors Tom Baker, Elisabeth Sladen, Alec Linstead, Patricia Maynard, Michael Kilgarriff and Edward Burnham, producers Barry Letts and Philip Hinchcliffe, script editor Terrance Dicks, director Christopher Barry and production unit manager George Gallacio.
The Tunnel Effect (dur. 13' 47"), a look at the creation of the Tom Baker Slit Scan title sequence.
A clip from Blue Peter, recorded on the Robot sets...
... and last but not least, a photo gallery, with production subtitle notes and Radio Times listings in pdf format.
Oh, and we've sent your questions off to Colin Teague, who is a very, very, very busy man - so we'll have to bare with him for the answers! Check back on SJ.tv in the coming weeks for more.