Pete Tyler lives in parallel London and made his money by selling Vitex health drinks. He first met the Doctor on the night of his wife's fortieth birthday. A man called John Lumic had created men of steel (cybermen) and they crashed the party and started "upgrading" people into them. They got Jackie, and turned her into one of them.
Some time afterwards, Pete stumbled across the Doctor again. This time, he went into his world and found the Jackie Tyler there. She had lost her husband too and she had a daughter called Rose.
Pete now live with Jackie and Mickey Smith in his world and Rose is back in the real world. He has another daughter, Billie. Pete works in the parallel Torchwood, and has a transporter so he can still hop from one world to the other (without ripping holes in the universe. torchwood technology)
