Other Heinlein novels featuring him include Time Enough for Love, The Number of the Beast, The Cat Who Walks Through Walls and To Sail Beyond the Sunset. Andrew "Slipstick" Libby, previously seen as a young adult in the short story "Misfit", also features prominently in this novel. In Time Enough for Love, Libby is said to have become Lazarus Long's partner in space travel until his death.