There is no Dr. Dominion in The Sims 2: Castaway on PSP (or any platform). You're likely confusing this with another game, a fan fiction, or a different Sims title.
| Feature | PSP | Wii/PS2 | DS |
|---|---|---|---|
| Graphics | Downscaled, lower poly | Full | 2D sprites, top-down |
| Controls | Analog nub + buttons | Wii Remote / DualShock | Touchscreen + D-pad |
| Multiplayer | Ad-hoc (local) — trade items | None | None |
| Story | Same core | Same core | Simplified, different quests |
Enjoy Castaway for what it is: a charming survival spin-off. No secret villain doctor—just coconuts, monkeys, and raft-building.