Jeff Rawle previously played the character Plantagenet in the original Doctor Who episode Frontios.
The International Gallery previously appeared in the Doctor Who Easter special Planet of The Dead.
Rani: (regarding the Mona Lisa's "theft") There's something freaky about this.
Clyde: Oh, here we go. Just because something shady happens, it doesn't mean there's aliens behind it. When my bike got nicked, do you think it was ET the ASBO, cycling home?
Haresh: Morning, 11-T.
Rani: Someone's in trouble; That's dad's serious face.
Clyde: Yeah, like he's got any other sort!
Sarah Jane: (readies the Sonic Lipstick) Sonic scarlet, my favourite shade.