Sontarans: really interested in women’s thoraxes, apparently.
Elisabeth Sladen and Brian Miller (who were married from 1968 until Sladen’s death in 2011) both appeared in Classic Who and New Who: she as Sarah Jane Smith, he as Dugdale in Snakedance, a Dalek voice in Resurrection of the Daleks and Remembrance of the Daleks, and a tramp in Deep Breath.
Though their time on Who did not overlap, they appeared opposite each other in the Sarah Jane Adventures episode The Mad Woman in the Attic:
Happy Birthday, Elisabeth Sladen (1 February 1946 - 19 April 2011)
TARDIS interiors - the boot cupboard
TARDIS interiors - the secondary console room
Time’s in flux, changing every second. Your cozy little world can be rewritten like that. Nothing is safe. Remember that. Nothing.