Have you met Miss Smith?  She’s my best friend. 

“It’s strictly a one way journey.”

The Seeds of Doom - season 13 - 1976

“To see if there was any sign of the old fellow, eh?”

Planet of the Spiders - season 11 - 1974

“Does he still stroke bits of the TARDIS?”
“Yeah! Yeah! He does! I’m like, do you two want to be alone?”
Doctor Who - School Reunion (2006)

“Gone to meet him.”

Robot - season 12 - 1975

“Why does he look so… disco?”

“…or rather fetlocks…”

Revenge of the Cybermen - season 12 - 1975

“Echoes of the Doctor, all over the world. With friends like us, he’s never going to die, is he?”