Lethbridge-Stewart: Top Secret Files was a free downloadable e-book omnibus collecting special extended editions of The Ambush! and final chapter of Companions: Fifty Years of Doctor Who Assistants, as well as the first chapter of The Forgotten Son, and exclusive original content.It was described as "an eBook introductory pack for the Lethbridge-Stewart series."
|The Ambush! (with extended scenes)||Andy Frankham-Allen|
|We Won't Let Him Down (extended final chapter)||Andy Frankham-Allen|
|What Lies Beyond|
|My Life with the Brig||Graeme Harper|
|The New World (exclusive prelude and first chapter)||Andy Frankham-Allen|
to be added