From the Doctor to My Son Thomas
"From the Doctor to My Son Thomas" is a viral video recorded by actor Peter Capaldi and sent to Thomas Goodall, an autistic nine-year-old boy in England, to console the child over grief from the death of Goodall's grandmother. Capaldi filmed the 42-second video in character as the Twelfth Doctor from the BBC science-fiction series Doctor Who.
Source: Wikipedia — From the Doctor to My Son Thomas (CC BY-SA 4.0)