The first thing your Tennant-Who fan needs to track down is Casanova: written by RTD, produced by Gardner, scored by Gold (much of the crew behind the first four seasons of nuWho) and featuring Tennant as the young Casanova. The story is framed by an old Casanova played by Peter O’Toole reminiscing about his youthful exploits. The biggest problem here is that O’Toole and Tennant look nothing alike. Their accents are completely different and they don’t even bother faking a shared mannerism or two despite playing the same character at different ages. Similarly, the last actor to play Casanova’s son has a harelip that none of the other kids did. That aside, Tennant’s Casanova is mischievous, opportunistic, cheerful, roguish, sexy, clever, mostly good hearted guy if slightly careless and strangely naive.