When the agents are being interviewed with a lie detector test, one question was you wash up on a deserted island with a single box. What is in it? to which, Agent Simmons replied, "The TARDIS"
After Fry stupidly altered the past and made Paul Revere relay the wrong message, America never separated from the UK. In the future we see a blue box on a street corner and a man with curly hair and a long multi-colored scarf gets off a bus and runs inside of it.
Tommy Pickles goes on amazing adventures that seem to at times transcend time and space. He has a dog, and always carries a Screwdriver. There is also one episode, not sure which where there is a toy in the background that looks a lot like a Dalek.