- See also: Doctor Geo Mandrake
Doctor Spider (ドクタースパイダー Dokutā Supaidā?) is a miniboss in Contra: Hard Corps. He is what's left of the hapless Doctor Geo Mandrake after being exposed to his own experiments using the alien cell. A monstrous mutated creation with both spider-like appearance and abilities.
Realizing the harm his research has done, Colonel Bahamut takes Doctor Geo Mandrake prisoner and, as the Hard Corps break into his base, he uses a ray (presumably) using alien cell technology on the doctor, making him mutate into a half-man/half-spider monster.
The hostile creature begins by making a complete run crawling along the room's walls; once he stops, it shoots a laser web string that ricochets along the room's walls, forming a spiderweb of sorts; after which, it climbs on it and follows the trail while shooting either single plasma beams that track the player or several ones in a spreading manner.
- This boss also appears in the Game Boy Advance game Contra Advance: The Alien Wars EX, a handheld port of Contra III: The Alien Wars; however, this is not a canonical appearance and has nothing to do with the plot. Likewise, neither Doctor Geo Mandrake nor Colonel Bahamut appear in this version, only the already transformed boss. The inclusion of the Big Battle stage was only to replace the overhead-view Sheer Cliff stage from the original game.