"Meanwhile, a couple of individuals associated with the show itself ably demonstrated that they really should have stuck to acting."

If you were lucky enough not to get The Twin Dilemma as your free Target novel with this month's party newsletter and you're a newer fan looking for a decent primer on the world of spin-off fiction, Talk About The Passion offers a two part article (part 1, part 2) describing what you've missed.  Sample:

"Despite the fact that some of their poorer offerings would have bored even the average ‘younger reader’ to tears, in the mid-seventies Target decided to have a try at adapting some of their Doctor Who books for an even more youthful, um, target audience. The responsibility for this fell to - you guessed it - Terrance Dicks, who completed ‘Junior’ versions of The Giant Robot and, rather more oddly, the notoriously gothic horror-tinged The Brain Of Morbius, before they realised the range was a non-started and cancelled it."

Found at Out of the Blue Six, who is also carrying the scan of a rather brilliant foreign cover for Morbeus, in which it appears to be have been co-opted by a couple of Billy Zane clones.