Big Finish release 158 Wirrn Isle, written by William Gallagher, directed by Nick Briggs, with Colin Baker as the Doctor and Lisa Greenwood as Flip Jackson.
The Wirrn are insectoid monsters from a classic Fourth Doctor serial The Ark in Space. They were successfully revived by Big Finish in Wirrn Dawn and here they are back again to threaten mankind. Doctor Six and Flip find themselves in a lonely outpost next to a frozen Loch Lomond some time after humans have been revived from the Nerva space ark. There are a variety of problems with Transmat devices and, of course, there is something nasty out on the ice.
I understand that this is the last of the stories with Lisa Greenwood as Flip for a while which is a shame as she makes a good companion for the Sixth Doctor. Colin Baker is as entertaining as ever and the sound design people do a really fantastic job, with some suitably creepy noises for the Wirrn. Almost as good as the creeping flesh effects in Destination Nerva.
I confess I did find all the techno-babble about the Transmat devices confusing and rather dull so this story gets 3 out of 5 green, slimy insect pupae. Next month's release sees the return of the Peter Davison, Janet Fielding, Mark Strickson and Sarah Sutton in The Emerald Tiger.