OVA 6 — The Master Breaks Into His Own Base

Continuity: canon-compatible comedy side story.

For reasons he refuses to explain, the Master enters his own facility disguised as an outside spy and attempts to reach a restricted area without using his authority.

Vesper is not told.

The episode becomes a security exercise from hell:

• Vesper detects an intruder and takes the response seriously.
• The Master avoids systems he designed and countermeasures he already understands.
• Vesper becomes increasingly irritated that the “spy” keeps surviving routes that should be impossible.
• The Master must conceal himself well enough to fool even Vesper temporarily, reinforcing rather than weakening his place above her.
• He never humiliates her for failing to identify him immediately.

The reveal should land on Vesper realizing what happened moments before he formally admits it. Her reaction is restrained, dangerous, and much funnier than shouting.