Aggamon is an enemy of Doctor Strange in the Marvel Comics universe.
The character, created by Stan Lee and Steve Ditko, first appeared in Strange Tales #119 (1964).
In the context of the stories, Aggamon is ruler of the Purple Dimension, a realm in which he tricks natives of other dimensions into visiting the place and forcing them to become slaves.
Read more about Aggamon: Aginar, Agon, Agron, Airborne, Aireo, Air-Walker, Ajak, Ajax, Ajaxis, Alaris, Albion, Alcmena, Aldebron, Alex, Caleb Alexander, Carrie Alexander, Alibar, Liz Allan, Allatou, Marlene Alraune, Al-Tariq, Amalgam, Amatsu-Mikaboshi, Amergin, American Samurai, Ammo, Amp, Amphibian, Amphibion, Amphibius, Amun, Anachronism, Analyzer, Animus, Annalee, Annihilus, Anthem, Anti-Cap, Antro, Anubis, Anvil, Apache Kid, Ape-X, Apex, Aphrodite, Apocryphus, Aquon, Arachne, Araki, Aralune, Arc, Argo The Almighty, Arishem The Judge, Arizona Annie, Arlok, Armageddon, Arm'Cheddon, Ashema The Listener, Mike Asher, Astron, Atum, Auric, Aurora, Autolycus, Avalanche, Avarrish, Avona, Awesome Android, Azazel