Oliver himself does not appear in–game until the final battle. In three out of the four endings, he is the very last opponent encountered before the game ends, appearing after you defeat Legate Lanius in both the "neutral" (Mr. House and Yes Man) endings and being the main antagonist (alongside President Kimball) in the Caesar's Legion ending. In the former two, he initially thinks that the player has won the Hoover Dam for the NCR but the player can either tell him their true intentions and attempt to make him surrender peacefully or attack him outright. Due to his stubbornness, General Oliver can only be successfully reasoned with if the player has a maximum Speech skill of 100. Otherwise, he and his men will attack only to be gunned down by an army of Securitrons behind them.