There's Something About Mary... was a 2|entertainDVD documentary. It featured Mary Tamm as she recounted her time on Doctor Who and described her take on portraying Romana I.
Booklet synopsis[]
Mary Tamm looks back at her time as the Doctor's companion Romana.
For the purposes of this list, a "DVD documentary" is one made especially for the Classic Series DVD range. For this reason, things like studio recordings, film trims/inserts and other documentaries featured on DVD releases are not included below.