Future’s End has sort of a Back to The Future 2 vibe. Old bearded Braxton talking to Janeway about time travel reminds me of Doc Brown’s lecture to Marty on the chalk board in the alternate 1985, and Doc showed Marty the newspaper clip of his alternate timeline self ending up in a mental institution, which is what happened to Braxton too. In BTTF-2 Biff Tannen gets hold of a sports almanac in 1955 from his future self and becomes very wealthy and powerful. In Future’s End Henry Starling get’s hold of Braxton’s 29th century time ship in the 1960s and becomes very wealthy and powerful. In BTTF-2s alternate 1985 Nixon’s still president. In Starling’s office there’s a picture of him with Nixon, though it’s unknown if Nixon’s presidency lasted longer in the timeline influenced by Starling and his acquired technology.