String Theory is a 2015 Big Finish Short Trips audio short story read by Stephen Critchlow. It featured the Fourth Doctor and Leela. It was released as a subscriber-only download, available to subscribers who purchased The Entropy Plague.
Collector's Item is a short trip featuring the Fourth Doctor and Sarah Jane Smith which was available to subscribers of Big Finish's main Doctor Who range whose subscription included Zaltys.
Taken For Granted is a short trip featuring the Third Doctor and Jo Grant which was available to subscribers of Big Finish's main Doctor Who range whose subscription included Iron Bright.
MedTech Chenka is alone. No Doctor. No TARDIS. No Molly O'Sullivan. But the strange environment she's stranded in is about to get even stranger, with Liv the only one who can help out. There's a message here, for her, and for someone very far away...
