well Richard was only the Doctor in the Comic Relief episode, if you count him you also have to count Rowan Atkinson, Jim Broadbent and Hugh Grant.
(,
Thu 14 Aug 2014, 12:36,
archived)
He also played the role in the (now non-canonical) attempt at a reboot(
Tribs 🦇 ↓ dn ʎɐʍ sᴉɥʇ ↓🦇,
Thu 14 Aug 2014, 13:13,
archived)