Theodore was travelling companion, friend and favourite to Peter Bull, and although only 3½ inches in height he stands very tall in character. Theodore was given to Peter Bull to celebrate a first night by his friend, Maurice Kaufmann. This gift was greatly welcomed as Peter had lost his first teddy bear to a jumble sale. For more than thirty-five years Theodore and Peter were inseparable. Peter refers to Theodore as 'a symbol of unloneliness'.

In each of Peter Bull's books, Theodore is mentioned with great affection. '...Only one Teddy can take first place in one's affections, and despite the material success of such personalities as Aloysius and Bully Bear, Theodore is The One'.

A Character actor of many years' standing, Peter Bull was perhaps best known on both sides of the Atlantic for such stage creations as Pozzo in 'Waiting for Godot', Tappercoom in 'The Ladys' not for Burning', and Sergeant Buzfuz in the musical 'Pickwick', and for his screen performances as the Russian Ambassador in 'Dr Strangelove', Thwackum in 'Tom Jones', and The Duchess in 'Alice in Wonderland. But Peter was also widely appreciated as author and television personality. His many books included the autobiographical 'Life of a Cucumber', 'I Say Look Here', and 'It Isn't all Greek to me', as well as 'Bear With Me', 'The Teddy Bear Book' and 'A Hug of Teddy Bears'. His 'To Sea in a Sieve' tells amusingly of his naval career (during World War II he rose from Ordinary Seaman to Commander, and received a distinguished Service Cross for Gallantry in action. In the world of television, he often appeared with his collection of teddy bears, including 'Aloysius and of course his own favourite 'Theodore'.